/* ==========================================
   ARCHITECTURE VISUALIZER — GOD MODE V4
   ==========================================
   Enhancements over V3:
   1.  @property declarations for animatable gradient vars
   2.  Richer layered grid background with radial vignette overlay
   3.  Spine: multi-stop gradient + layered travel dot with comet tail
   4.  Node boxes: deep glass layering, shimmer ::after, richer hover glow
   5.  Connector: gradient line with mid-pulse dot + arrow refinement
   6.  Gallery cards: prismatic top bar, inner glow, stagger entry animation
   7.  Decision diamond: layered drop-shadow system, inner shine
   8.  Parallel lanes: glass morphism refinement, lane title accent pip
   9.  Annotation node: warm amber glass, dashed connector refinement
   10. Loop indicator: dashed + arrow head treatment
   11. Step types: richer semantic color systems per type
   12. Typography: weight + tracking improvements across all labels
   13. Dark mode: comprehensive obsidian overrides for all new surfaces
   14. Mobile: refined bottom-sheet safe areas
   ========================================== */

/* ==========================================
   @PROPERTY — Animatable CSS custom properties
   ========================================== */
@property --spine-glow-opacity {
  syntax: '<number>';
  inherits: false;
  initial-value: 0.2;
}

@property --card-shimmer {
  syntax: '<percentage>';
  inherits: false;
  initial-value: -120%;
}

/* ==========================================
   0. GLOBAL VARIABLES
   ========================================== */
:root {
    /* Layout */
    --arch-max-width: 960px;
    --arch-card-min: 300px;

    /* Connectors */
    --connector-gap: 52px;
    --connector-width: 2px;
    --connector-color: var(--border-medium);
    --connector-arrow-size: 7px;

    /* Nodes */
    --node-max-width: 620px;
    --node-padding: 28px 36px;
    --node-radius: 16px;

    /* Spine */
    --spine-width: 2px;
    --stagger-base: 80ms;

    /* Branches */
    --branch-indent: 40px;
    --branch-line-offset: calc(var(--branch-indent) + 1px);

    /* Semantic accent RGBs — fully defined */
    --accent-warning-rgb: 245, 158, 11;
    --accent-success-rgb: 16, 185, 129;
    --accent-danger-rgb: 239, 68, 68;
    --accent-secondary-rgb: 99, 102, 241;
    --accent-primary-rgb: 8, 145, 178;
    --accent-tertiary-rgb: 139, 92, 246;
}

/* ==========================================
   KEYFRAMES — Centralized library
   ========================================== */
@keyframes archHeaderReveal {
    from { opacity: 0; transform: translateY(-18px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes nodeReveal {
    from { opacity: 0; transform: translateY(28px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes connectorDraw {
    from { transform: scaleY(0); opacity: 0; }
    to   { transform: scaleY(1); opacity: 1; }
}

@keyframes spinePulse {
    0%, 100% { opacity: 0.18; }
    50%       { opacity: 0.5; }
}

@keyframes spineDotTravel {
    0%   { top: 2%;  opacity: 0; transform: translateX(-50%) scale(0.5); }
    6%   { opacity: 1; transform: translateX(-50%) scale(1); }
    92%  { opacity: 1; transform: translateX(-50%) scale(1); }
    100% { top: 97%; opacity: 0; transform: translateX(-50%) scale(0.5); }
}

@keyframes spineCometFade {
    0%, 100% { height: 0; opacity: 0; }
    10%, 85% { opacity: 1; }
    50%      { height: 28px; }
}

@keyframes loopBorderPulse {
    0%, 100% { border-color: rgba(var(--accent-secondary-rgb), 0.25); }
    50%       { border-color: rgba(var(--accent-secondary-rgb), 0.6); }
}

@keyframes loopSpin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

@keyframes cardEntry {
    from { opacity: 0; transform: translateY(20px) scale(0.96); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.4; }
    50%       { opacity: 0.9; }
}

@keyframes connectorMidDot {
    0%, 100% { opacity: 0.3; transform: translateX(-50%) scale(0.8); }
    50%       { opacity: 1;   transform: translateX(-50%) scale(1.3); }
}

@keyframes decisionPulse {
    0%, 100% {
        filter:
            drop-shadow(0 0 8px rgba(var(--accent-warning-rgb), 0.4))
            drop-shadow(0 6px 20px rgba(var(--accent-warning-rgb), 0.15));
    }
    50% {
        filter:
            drop-shadow(0 0 16px rgba(var(--accent-warning-rgb), 0.65))
            drop-shadow(0 10px 32px rgba(var(--accent-warning-rgb), 0.28));
    }
}

@keyframes archBarSweep {
    from { transform: scaleX(0); opacity: 0; }
    to   { transform: scaleX(1); opacity: 1; }
}

/* ==========================================
   1. MAIN CONTAINER
   ========================================== */
#archView {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 60;
    background: var(--bg-primary);
    overflow-y: auto;
    overflow-x: hidden;
    display: none;
    scroll-behavior: smooth;

    /* Layered grid: major + minor lines + radial depth vignette */
    background-image:
        /* Radial vignette for depth */
        radial-gradient(ellipse 90% 70% at 50% 50%, transparent 40%, rgba(0,0,0,0.025) 100%),
        /* Major grid — accent tinted */
        linear-gradient(rgba(var(--accent-primary-rgb), 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--accent-primary-rgb), 0.045) 1px, transparent 1px),
        /* Minor grid — neutral */
        linear-gradient(rgba(0, 0, 0, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.018) 1px, transparent 1px);
    background-size:
        100% 100%,
        120px 120px,
        120px 120px,
        30px 30px,
        30px 30px;

    /* Atmospheric top glow */
    box-shadow: inset 0 0 120px rgba(var(--accent-primary-rgb), 0.03);
}

#archView::-webkit-scrollbar { width: 5px; }
#archView::-webkit-scrollbar-track { background: transparent; }
#archView::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, var(--border-medium), var(--border-light));
    border-radius: 9999px;
    background-clip: content-box;
}
#archView::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, var(--border-dark), var(--border-medium));
    background-clip: content-box;
}

/* ==========================================
   2. WRAPPERS
   ========================================== */
.arch-visualizer {
    width: 100%;
    padding: calc(var(--header-height) + 20px) 20px 80px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Wrapper: full-width flex column, header + gallery as separate children */
.arch-gallery-wrapper {
    width: 100%;
    max-width: var(--arch-max-width);
    padding: calc(var(--header-height) + 20px) 20px 80px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin: 0 auto;
}

/* Gallery: card grid only — no header inside */
.arch-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--arch-card-min), 1fr));
    gap: 24px;
    align-items: stretch;
    width: 100%;
}

/* ==========================================
   3. VIZ HEADER — Dramatic reveal with gradient rule
   ========================================== */
.viz-header {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 16px;
    width: 100%;
    margin-bottom: 44px;
    padding-bottom: 26px;
    position: relative;
    animation: archHeaderReveal 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* Primary gradient separator line */
.viz-header::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 100%; height: 1px;
    background: linear-gradient(
        90deg,
        var(--accent-primary) 0%,
        var(--accent-secondary) 40%,
        rgba(var(--accent-tertiary-rgb), 0.4) 65%,
        transparent 85%
    );
    transform-origin: left center;
    animation: archBarSweep 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
    pointer-events: none;
}

/* Glow halo under the separator */
.viz-header::before {
    content: '';
    position: absolute;
    bottom: -3px; left: 0;
    width: 60%; height: 6px;
    background: radial-gradient(
        ellipse at left,
        rgba(var(--accent-primary-rgb), 0.18),
        transparent 80%
    );
    pointer-events: none;
    filter: blur(4px);
}

.viz-title-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex: 1;
    min-width: 0;
}

.viz-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.035em;
    line-height: 1.15;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    /* Subtle gradient on title text */
    background: linear-gradient(135deg, var(--text-primary) 60%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.viz-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    letter-spacing: 0.01em;
}

.viz-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    border: 1.5px solid var(--border-medium);
    color: var(--text-secondary);
    padding: 9px 18px;
    border-radius: 9999px;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    cursor: pointer;
    transition:
        background var(--transition-base),
        color var(--transition-base),
        border-color var(--transition-base),
        transform var(--transition-base),
        box-shadow var(--transition-base);
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    position: relative;
    overflow: hidden;
}

/* Shine sweep on back button */
.viz-back-btn::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 55%;
    height: 100%;
    background: linear-gradient(105deg, transparent 20%, rgba(255,255,255,0.4) 50%, transparent 80%);
    transform: skewX(-18deg);
    pointer-events: none;
}

.viz-back-btn:hover::before {
    animation: shimmerSweep 0.65s ease forwards;
}

@keyframes shimmerSweep {
    to { left: 160%; }
}

.viz-back-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateX(-4px);
    box-shadow:
        0 4px 18px rgba(var(--accent-primary-rgb), 0.38),
        0 1px 4px rgba(0,0,0,0.08);
}

.viz-back-btn:active {
    transform: translateX(-2px) scale(0.97);
    box-shadow: 0 2px 8px rgba(var(--accent-primary-rgb), 0.25);
}

.viz-back-btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
    border-radius: 9999px;
}

/* ==========================================
   4. GALLERY CARDS — Premium lift cards
   ========================================== */
.arch-card {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 28px;
    cursor: pointer;
    transition:
        transform 0.30s cubic-bezier(0.25, 1, 0.5, 1),
        box-shadow 0.30s ease,
        border-color 0.22s ease,
        background 0.22s ease;
    position: relative;
    overflow: hidden;
    box-shadow:
        var(--shadow-sm),
        inset 0 1px 0 rgba(255,255,255,0.8);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-self: stretch;
    outline: none;
    /* Stagger entry */
    opacity: 0;
    animation: cardEntry 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.arch-card:nth-child(1) { animation-delay: 0.06s; }
.arch-card:nth-child(2) { animation-delay: 0.12s; }
.arch-card:nth-child(3) { animation-delay: 0.18s; }
.arch-card:nth-child(4) { animation-delay: 0.24s; }
.arch-card:nth-child(5) { animation-delay: 0.30s; }
.arch-card:nth-child(6) { animation-delay: 0.36s; }
.arch-card:nth-child(7) { animation-delay: 0.42s; }
.arch-card:nth-child(8) { animation-delay: 0.48s; }

/* Animated prismatic top bar */
.arch-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(
        90deg,
        var(--accent-primary) 0%,
        var(--accent-secondary) 55%,
        var(--accent-tertiary, var(--accent-secondary)) 100%
    );
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.36s cubic-bezier(0.25, 1, 0.5, 1);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    pointer-events: none;
}

/* Corner arrow badge */
.arch-card::after {
    content: '';
    position: absolute;
    top: 16px; right: 16px;
    width: 16px; height: 16px;
    border-top: 2px solid rgba(var(--accent-primary-rgb), 0.5);
    border-right: 2px solid rgba(var(--accent-primary-rgb), 0.5);
    border-top-right-radius: 5px;
    opacity: 0;
    transition: opacity 0.24s ease, transform 0.24s ease;
    transform: scale(0.5) translate(4px, -4px);
    pointer-events: none;
}

.arch-card:hover {
    transform: translateY(-8px);
    border-color: rgba(var(--accent-primary-rgb), 0.32);
    background: var(--bg-secondary);
    box-shadow:
        0 20px 48px rgba(var(--accent-primary-rgb), 0.15),
        0 8px 16px rgba(0, 0, 0, 0.06),
        0 0 0 1px rgba(var(--accent-primary-rgb), 0.1),
        inset 0 1px 0 rgba(255,255,255,0.9);
}

.arch-card:hover::before { transform: scaleX(1); }
.arch-card:hover::after  { opacity: 1; transform: scale(1) translate(0, 0); }

.arch-card:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
    box-shadow:
        0 0 0 4px rgba(var(--accent-primary-rgb), 0.14),
        var(--shadow-md);
}

.arch-card:active { transform: translateY(-3px); }

/* Radial inner glow — revealed on hover */
.arch-card-inner-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        ellipse 70% 50% at 50% 0%,
        rgba(var(--accent-primary-rgb), 0.055),
        transparent 75%
    );
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.35s ease;
    border-radius: inherit;
}
.arch-card:hover .arch-card-inner-glow { opacity: 1; }

/* Subtle bottom ambient glow */
.arch-card-inner-glow::after {
    content: '';
    position: absolute;
    bottom: -8px; left: 20%; right: 20%;
    height: 20px;
    background: radial-gradient(
        ellipse,
        rgba(var(--accent-primary-rgb), 0.1),
        transparent 80%
    );
    filter: blur(6px);
    pointer-events: none;
}

.arch-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: var(--font-size-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-primary);
    background: rgba(var(--accent-primary-rgb), 0.08);
    padding: 4px 11px;
    border-radius: 9999px;
    margin-bottom: 14px;
    align-self: flex-start;
    border: 1px solid rgba(var(--accent-primary-rgb), 0.18);
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
}
.arch-card:hover .arch-category {
    background: rgba(var(--accent-primary-rgb), 0.13);
    box-shadow: 0 0 12px rgba(var(--accent-primary-rgb), 0.1);
}

.arch-title {
    font-size: var(--font-size-lg);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.25;
    letter-spacing: -0.028em;
}

.arch-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-top: auto;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.arch-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--border-light);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.arch-card-meta-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent-success);
    box-shadow:
        0 0 0 3px rgba(var(--accent-success-rgb), 0.15),
        0 0 8px rgba(var(--accent-success-rgb), 0.6);
    flex-shrink: 0;
    animation: glowPulse 2.5s ease-in-out infinite;
}

/* ==========================================
   5. FLOW CONTAINER + SPINE
   ========================================== */
.flow-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: var(--arch-max-width);
    padding: 28px 0 90px;
    position: relative;
}

/* Animated spine: dual-layer gradient pulse */
.flow-container::before {
    content: '';
    position: absolute;
    top: 0; bottom: 0;
    left: 50%;
    margin-left: calc(var(--spine-width) / -2);
    width: var(--spine-width);
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(var(--accent-primary-rgb), 0.6) 10%,
        var(--accent-primary) 30%,
        var(--accent-secondary) 55%,
        rgba(var(--accent-tertiary-rgb), 0.7) 75%,
        var(--accent-primary) 88%,
        transparent 100%
    );
    animation: spinePulse 3.2s ease-in-out infinite;
    opacity: 0.22;
    z-index: 0;
    pointer-events: none;
    border-radius: 9999px;
}

/* Travelling dot — the focal point of the spine */
.flow-spine-dot {
    position: absolute;
    left: 50%;
    top: 0;
    width: 8px; height: 8px;
    margin-left: -4px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow:
        0 0 0 3px rgba(var(--accent-primary-rgb), 0.2),
        0 0 12px rgba(var(--accent-primary-rgb), 0.8),
        0 0 28px rgba(var(--accent-primary-rgb), 0.35);
    animation: spineDotTravel 3.4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    z-index: 3;
    pointer-events: none;
}

/* Comet tail below the dot */
.flow-spine-dot::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: linear-gradient(to bottom, rgba(var(--accent-primary-rgb), 0.6), transparent);
    border-radius: 9999px;
    animation: spineCometFade 3.4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    pointer-events: none;
}

/* ==========================================
   6. FLOW STEPS
   ========================================== */
.flow-step {
    width: 100%;
    display: flex;
    justify-content: center;
    position: relative;
    margin-bottom: var(--connector-gap);
    opacity: 0;
    animation: nodeReveal 0.58s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Stagger 12 deep */
.flow-step:nth-child(1)  { animation-delay: 0.08s; }
.flow-step:nth-child(2)  { animation-delay: 0.16s; }
.flow-step:nth-child(3)  { animation-delay: 0.24s; }
.flow-step:nth-child(4)  { animation-delay: 0.32s; }
.flow-step:nth-child(5)  { animation-delay: 0.40s; }
.flow-step:nth-child(6)  { animation-delay: 0.48s; }
.flow-step:nth-child(7)  { animation-delay: 0.56s; }
.flow-step:nth-child(8)  { animation-delay: 0.64s; }
.flow-step:nth-child(9)  { animation-delay: 0.72s; }
.flow-step:nth-child(10) { animation-delay: 0.80s; }
.flow-step:nth-child(11) { animation-delay: 0.88s; }
.flow-step:nth-child(12) { animation-delay: 0.96s; }

/* ==========================================
   7. STEP BOX — Deep glass base node
   ========================================== */
.step-box {
    width: 100%;
    max-width: var(--node-max-width);
    min-height: 84px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--node-padding);
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-light);
    border-radius: var(--node-radius);
    position: relative;
    z-index: 2;
    box-shadow:
        0 1px 2px rgba(0,0,0,0.04),
        0 4px 10px rgba(0,0,0,0.05),
        0 0 0 1px rgba(255,255,255,0.7) inset,
        0 1px 0 rgba(255,255,255,0.9) inset;
    transition:
        transform 0.28s cubic-bezier(0.25, 0.8, 0.25, 1),
        box-shadow 0.28s ease,
        border-color 0.22s ease,
        background 0.22s ease;
    isolation: isolate;
}

/* Glass highlight layer */
.step-box::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(
        170deg,
        rgba(255,255,255,0.55) 0%,
        rgba(255,255,255,0.1) 30%,
        transparent 55%
    );
    pointer-events: none;
    z-index: 1;
}

.step-box:hover {
    transform: translateY(-6px) scale(1.012);
    border-color: rgba(var(--accent-primary-rgb), 0.38);
    box-shadow:
        0 0 0 1px rgba(var(--accent-primary-rgb), 0.18),
        0 20px 48px rgba(var(--accent-primary-rgb), 0.16),
        0 8px 16px rgba(0,0,0,0.06),
        0 1px 0 rgba(255,255,255,0.9) inset;
    background: var(--bg-secondary);
    z-index: 10;
}

/* Connection dot above node */
.step-box::before {
    content: '';
    position: absolute;
    top: -11px; left: 50%;
    transform: translateX(-50%);
    width: 11px; height: 11px;
    background: var(--border-medium);
    border-radius: 50%;
    border: 2.5px solid var(--bg-secondary);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 12;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.step-box:hover::before {
    background: var(--accent-success);
    border-color: var(--bg-secondary);
    box-shadow:
        0 0 0 4px rgba(var(--accent-success-rgb), 0.18),
        0 0 16px rgba(var(--accent-success-rgb), 0.7);
    transform: translateX(-50%) scale(1.3);
}

/* ==========================================
   CONNECTORS — Gradient lines with mid-pulse
   ========================================== */
.flow-step:not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: calc(var(--connector-gap) * -1);
    left: 50%;
    margin-left: calc(var(--connector-width) / -2);
    width: var(--connector-width);
    height: var(--connector-gap);
    background: linear-gradient(
        to bottom,
        var(--border-medium),
        rgba(var(--accent-primary-rgb), 0.65) 55%,
        rgba(var(--accent-primary-rgb), 0.4)
    );
    border-radius: 9999px;
    z-index: 1;
    transform-origin: top center;
    animation: connectorDraw 0.48s cubic-bezier(0.16, 1, 0.3, 1) both 0.08s;
}

/* Arrowhead */
.flow-step:not(:last-child)::before {
    content: '';
    position: absolute;
    bottom: calc(var(--connector-gap) * -1 + (var(--connector-gap) / 2) - 5px);
    left: 50%;
    transform: translateX(-50%);
    border-left: var(--connector-arrow-size) solid transparent;
    border-right: var(--connector-arrow-size) solid transparent;
    border-top: calc(var(--connector-arrow-size) * 1.2) solid rgba(var(--accent-primary-rgb), 0.6);
    z-index: 2;
    filter: drop-shadow(0 2px 4px rgba(var(--accent-primary-rgb), 0.3));
}

/* ==========================================
   8. STEP TYPES — Semantic node variants
   ========================================== */

/* START: Capsule — Success green */
.step-type-start .step-box {
    border-radius: 9999px;
    border: 2px solid var(--accent-success);
    background: linear-gradient(
        135deg,
        var(--bg-secondary),
        rgba(var(--accent-success-rgb), 0.08)
    );
    box-shadow:
        0 0 0 5px rgba(var(--accent-success-rgb), 0.07),
        0 4px 14px rgba(var(--accent-success-rgb), 0.12),
        inset 0 1px 0 rgba(255,255,255,0.6);
    padding: 18px 40px;
    min-height: unset;
}

.step-type-start .step-box:hover {
    box-shadow:
        0 0 0 5px rgba(var(--accent-success-rgb), 0.14),
        0 20px 48px rgba(var(--accent-success-rgb), 0.22),
        inset 0 1px 0 rgba(255,255,255,0.7);
    border-color: var(--accent-success);
}

.step-type-start .step-box::before {
    background: var(--accent-success);
    box-shadow:
        0 0 0 3px rgba(var(--accent-success-rgb), 0.18),
        0 0 16px rgba(var(--accent-success-rgb), 0.8);
}

.step-type-start .step-index,
.step-type-end .step-index { display: none; }

/* END: Capsule — Danger red */
.step-type-end .step-box {
    border-radius: 9999px;
    border: 2px solid var(--accent-danger);
    background: linear-gradient(
        135deg,
        var(--bg-secondary),
        rgba(var(--accent-danger-rgb), 0.08)
    );
    box-shadow:
        0 0 0 5px rgba(var(--accent-danger-rgb), 0.07),
        0 4px 14px rgba(var(--accent-danger-rgb), 0.12),
        inset 0 1px 0 rgba(255,255,255,0.6);
    padding: 18px 40px;
    min-height: unset;
}

.step-type-end .step-box:hover {
    border-color: var(--accent-danger);
    box-shadow:
        0 0 0 5px rgba(var(--accent-danger-rgb), 0.14),
        0 20px 48px rgba(var(--accent-danger-rgb), 0.22),
        inset 0 1px 0 rgba(255,255,255,0.7);
}

.step-type-end .step-box::before {
    background: var(--accent-danger);
    box-shadow:
        0 0 0 3px rgba(var(--accent-danger-rgb), 0.18),
        0 0 16px rgba(var(--accent-danger-rgb), 0.8);
}

/* HIGHLIGHT: Left accent rail — Cyan */
.step-type-highlight .step-box {
    border: 1.5px solid rgba(var(--accent-primary-rgb), 0.28);
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--node-radius);
    background: linear-gradient(
        135deg,
        rgba(var(--accent-primary-rgb), 0.04) 0%,
        var(--bg-secondary) 60%
    );
    box-shadow:
        -4px 0 18px rgba(var(--accent-primary-rgb), 0.14),
        0 4px 10px rgba(0,0,0,0.04),
        inset 0 1px 0 rgba(255,255,255,0.7);
}

.step-type-highlight .step-box:hover {
    box-shadow:
        -4px 0 28px rgba(var(--accent-primary-rgb), 0.28),
        0 0 0 1px rgba(var(--accent-primary-rgb), 0.2),
        0 20px 48px rgba(var(--accent-primary-rgb), 0.14),
        inset 0 1px 0 rgba(255,255,255,0.7);
}

/* CONTAINER: Dashed boundary */
.step-type-container .step-box {
    background: rgba(var(--accent-primary-rgb), 0.015);
    border: 1.5px dashed var(--border-medium);
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.02);
}

.step-type-container .step-box:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.38);
    border-style: dashed;
    box-shadow:
        inset 0 2px 8px rgba(0,0,0,0.02),
        0 0 0 1px rgba(var(--accent-primary-rgb), 0.08);
}

/* ==========================================
   DECISION DIAMOND
   ========================================== */
.step-type-decision {
    margin-bottom: calc(var(--connector-gap) + 20px);
}

.step-type-decision.flow-step:not(:last-child)::after {
    height: calc(var(--connector-gap) + 20px);
    bottom: calc((var(--connector-gap) + 20px) * -1);
}

.step-type-decision.flow-step:not(:last-child)::before {
    bottom: calc((var(--connector-gap) + 20px) * -1 + (var(--connector-gap) + 20px) / 2 - 5px);
}

.step-type-decision .step-box {
    width: 210px;
    height: 210px;
    max-width: 210px;
    min-height: unset;
    padding: 0;
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    border-radius: 0;
    background: linear-gradient(
        135deg,
        rgba(255,255,255,0.95) 0%,
        rgba(var(--accent-warning-rgb), 0.1) 100%
    );
    border: none;
    /* drop-shadow respects clip-path — box-shadow does not */
    filter:
        drop-shadow(0 0 10px rgba(var(--accent-warning-rgb), 0.42))
        drop-shadow(0 8px 24px rgba(var(--accent-warning-rgb), 0.18));
    box-shadow: none;
    justify-content: center;
    align-items: center;
    display: flex;
    transition: transform 0.32s ease, filter 0.32s ease;
    animation: decisionPulse 3s ease-in-out infinite;
}

.step-type-decision .step-box::before { display: none; }
.step-type-decision .step-box::after  { display: none; }

.step-type-decision .step-box:hover {
    transform: translateY(-5px) scale(1.06);
    filter:
        drop-shadow(0 0 18px rgba(var(--accent-warning-rgb), 0.68))
        drop-shadow(0 16px 40px rgba(var(--accent-warning-rgb), 0.28));
    animation-play-state: paused;
}

.step-type-decision .step-label {
    font-size: var(--font-size-xs);
    padding: 0 30px;
    line-height: 1.35;
}

.decision-branch-labels {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: var(--node-max-width);
    padding: 0 28px;
    margin-top: -30px;
    position: relative;
    z-index: 3;
    pointer-events: none;
}

.decision-label-yes,
.decision-label-no {
    font-size: var(--font-size-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    padding: 3px 11px;
    border-radius: 9999px;
}

.decision-label-yes {
    color: var(--accent-success);
    background: rgba(var(--accent-success-rgb), 0.1);
    border: 1.5px solid rgba(var(--accent-success-rgb), 0.28);
    box-shadow: 0 0 10px rgba(var(--accent-success-rgb), 0.08);
}

.decision-label-no {
    color: var(--accent-danger);
    background: rgba(var(--accent-danger-rgb), 0.1);
    border: 1.5px solid rgba(var(--accent-danger-rgb), 0.28);
    box-shadow: 0 0 10px rgba(var(--accent-danger-rgb), 0.08);
}

/* ==========================================
   PARALLEL LANES
   ========================================== */
.flow-step-parallel {
    width: 100%;
    max-width: var(--arch-max-width);
    position: relative;
    margin-bottom: var(--connector-gap);
    opacity: 0;
    animation: nodeReveal 0.58s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.flow-step-parallel:nth-child(1) { animation-delay: 0.08s; }
.flow-step-parallel:nth-child(2) { animation-delay: 0.16s; }
.flow-step-parallel:nth-child(3) { animation-delay: 0.24s; }
.flow-step-parallel:nth-child(4) { animation-delay: 0.32s; }
.flow-step-parallel:nth-child(5) { animation-delay: 0.40s; }
.flow-step-parallel:nth-child(6) { animation-delay: 0.48s; }

.parallel-header {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--text-muted);
    margin-bottom: 16px;
    padding: 6px 18px;
    background: var(--bg-tertiary);
    border: 1.5px solid var(--border-light);
    border-radius: 9999px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,0.7);
}

/* Accent pip in parallel header */
.parallel-header::before {
    content: '';
    display: inline-block;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    box-shadow: 0 0 6px rgba(var(--accent-primary-rgb), 0.6);
    flex-shrink: 0;
}

.parallel-lanes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    position: relative;
}

/* Center divider */
.parallel-lanes::before {
    content: '';
    position: absolute;
    top: 5%; bottom: 5%; left: 50%;
    width: 1px;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--border-medium) 25%,
        var(--border-medium) 75%,
        transparent
    );
    pointer-events: none;
    z-index: 0;
}

.parallel-lane {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 22px;
    background: rgba(255,255,255,0.6);
    border: 1.5px solid var(--border-light);
    border-radius: var(--radius-lg);
    position: relative;
    z-index: 1;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,0.7);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.parallel-lane:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.22);
    box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.7);
}

.parallel-lane-title {
    font-size: var(--font-size-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-primary);
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(var(--accent-primary-rgb), 0.14);
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: 7px;
}

/* Lane title accent pip */
.parallel-lane-title::before {
    content: '';
    display: inline-block;
    width: 3px; height: 12px;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
    border-radius: 9999px;
    box-shadow: 0 0 6px rgba(var(--accent-primary-rgb), 0.4);
    flex-shrink: 0;
}

.parallel-step {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.55;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-xs);
}

.parallel-step:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.28);
    transform: translateX(3px);
    box-shadow: var(--shadow-sm), 0 0 0 1px rgba(var(--accent-primary-rgb), 0.08);
}

.parallel-step-label {
    font-weight: 700;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    margin-bottom: 5px;
    letter-spacing: -0.01em;
}

/* ==========================================
   ANNOTATION / NOTE NODE
   ========================================== */
.step-type-annotation {
    justify-content: flex-end;
}

.step-type-annotation .step-box {
    max-width: 350px;
    background: linear-gradient(
        135deg,
        rgba(var(--accent-warning-rgb), 0.07) 0%,
        rgba(255, 255, 255, 0.95) 60%
    );
    border: 1.5px dashed rgba(var(--accent-warning-rgb), 0.38);
    border-left: 3px solid var(--accent-warning);
    border-radius: var(--radius-md);
    margin-left: auto;
    margin-right: 0;
    transform: translateX(20px);
    box-shadow:
        -4px 0 12px rgba(var(--accent-warning-rgb), 0.08),
        0 4px 12px rgba(0,0,0,0.04),
        inset 0 1px 0 rgba(255,255,255,0.8);
    transition:
        transform 0.28s ease,
        border-color 0.22s ease,
        box-shadow 0.28s ease,
        background 0.22s ease;
}

.step-type-annotation .step-box:hover {
    transform: translateX(16px) translateY(-4px);
    border-color: rgba(var(--accent-warning-rgb), 0.65);
    border-left-color: var(--accent-warning);
    box-shadow:
        -4px 0 20px rgba(var(--accent-warning-rgb), 0.18),
        0 12px 32px rgba(var(--accent-warning-rgb), 0.12),
        inset 0 1px 0 rgba(255,255,255,0.8);
}

/* Connector bridge — accounts for translateX(20px) on the box */
.step-type-annotation::before {
    content: '';
    position: absolute;
    top: 50%;
    right: calc(100% - 20px);
    width: 40px;
    height: 0;
    border-top: 1.5px dashed rgba(var(--accent-warning-rgb), 0.5);
    transform: translateY(-50%);
    pointer-events: none;
    z-index: 1;
}

/* ==========================================
   LOOP INDICATOR
   ========================================== */
.step-has-loop::after {
    content: '';
    position: absolute;
    left: calc(50% - var(--node-max-width) / 2 - 38px);
    top: 50%;
    width: 38px;
    height: calc(var(--connector-gap) * 2 + 88px);
    border: 2px dashed rgba(var(--accent-secondary-rgb), 0.35);
    border-right: none;
    border-radius: 16px 0 0 16px;
    transform: translateY(-50%);
    z-index: 1;
    background: none;
    animation: loopBorderPulse 2.2s ease-in-out infinite;
}

/* Loop back arrow point at top */
.step-has-loop::before {
    content: '';
    position: absolute;
    left: calc(50% - var(--node-max-width) / 2 - 43px);
    top: calc(50% - var(--connector-gap) - 44px + 8px);
    width: 0; height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 8px solid rgba(var(--accent-secondary-rgb), 0.55);
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(0 0 4px rgba(var(--accent-secondary-rgb), 0.4));
}

.step-has-loop .step-label::after {
    content: '↺';
    display: inline-block;
    margin-left: 7px;
    font-size: 0.9em;
    color: var(--accent-secondary);
    animation: loopSpin 2.8s linear infinite;
    vertical-align: middle;
}

/* ==========================================
   9. STEP TYPOGRAPHY
   ========================================== */
.step-label {
    font-size: var(--font-size-md);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    z-index: 10;
    line-height: 1.3;
}

.step-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-light);
    position: relative;
    z-index: 10;
    text-transform: none;
    letter-spacing: 0;
    font-weight: 400;
    text-align: left;
}

.step-index {
    position: absolute;
    top: 14px; right: 16px;
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 9999px;
    padding: 2px 9px;
    letter-spacing: 0.05em;
    z-index: 12;
    transition: all var(--transition-fast);
    pointer-events: none;
    font-variant-numeric: tabular-nums;
}

.step-box:hover .step-index {
    background: rgba(var(--accent-primary-rgb), 0.1);
    border-color: rgba(var(--accent-primary-rgb), 0.25);
    color: var(--accent-primary);
    box-shadow: 0 0 8px rgba(var(--accent-primary-rgb), 0.12);
}

/* ==========================================
   10. NESTED CHILDREN
   ========================================== */
.step-children {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
    margin-left: var(--branch-indent);
    padding: 22px;
    background: rgba(var(--accent-primary-rgb), 0.015);
    border-radius: var(--radius-lg);
    border: 1.5px solid var(--border-light);
    box-shadow:
        inset 0 2px 10px rgba(0,0,0,0.022),
        inset 0 0 0 1px rgba(255,255,255,0.6);
    position: relative;
}

/* Horizontal branch line */
.step-children::before {
    content: '';
    position: absolute;
    top: 50%;
    left: calc(var(--branch-line-offset) * -1);
    width: var(--branch-indent);
    height: 2px;
    background: linear-gradient(to right, transparent, var(--border-medium));
    transform: translateY(-50%);
    pointer-events: none;
}

/* Branch arrow */
.step-children::after {
    content: '';
    position: absolute;
    top: 50%;
    left: calc(var(--branch-line-offset) * -1);
    width: 8px; height: 8px;
    border-top: 2px solid var(--border-medium);
    border-left: 2px solid var(--border-medium);
    transform: translateY(-50%) rotate(-45deg);
    pointer-events: none;
}

/* ==========================================
   11. MOBILE
   ========================================== */
@media (max-width: 768px) {
    #archView { z-index: 150; }

    .arch-gallery-wrapper { padding-left: 16px; padding-right: 16px; }

    .flow-container { padding: 14px 0 50px; }

    .viz-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        margin-bottom: 28px;
        padding-bottom: 20px;
    }

    .viz-back-btn { order: -1; }
    .viz-title { white-space: normal; -webkit-text-fill-color: unset; color: var(--text-primary); }
    .viz-subtitle { white-space: normal; }

    .step-box { max-width: 100%; padding: 18px 20px; }

    .step-type-decision .step-box {
        width: 160px; height: 160px; max-width: 160px;
    }

    .step-type-decision.flow-step:not(:last-child)::after {
        height: calc(var(--connector-gap) + 20px);
        bottom: calc((var(--connector-gap) + 20px) * -1);
    }

    .parallel-lanes { grid-template-columns: 1fr; gap: 14px; }
    .parallel-lanes::before { display: none; }

    .step-type-annotation .step-box {
        transform: translateX(0);
        max-width: 100%;
        border-radius: var(--radius-md);
    }
    .step-type-annotation::before { display: none; }

    .step-children {
        margin-left: 0;
        background: transparent;
        border: 1.5px dashed var(--border-medium);
        box-shadow: none;
    }
    .step-children::before,
    .step-children::after { display: none; }

    .step-has-loop::after  { display: none; }
    .step-has-loop::before { display: none; }
    .flow-spine-dot { display: none; }

    .decision-branch-labels { padding: 0 12px; }
}

@media (max-width: 480px) {
    .arch-gallery { grid-template-columns: 1fr; }
    .arch-visualizer { padding-left: 14px; padding-right: 14px; }
    .step-type-start .step-box,
    .step-type-end .step-box { padding: 14px 28px; }
}

/* ==========================================
   12. DARK MODE — Obsidian overrides
   ========================================== */
[data-theme="dark"] #archView {
    background-image:
        radial-gradient(ellipse 90% 70% at 50% 50%, transparent 40%, rgba(0,0,0,0.18) 100%),
        linear-gradient(rgba(var(--accent-primary-rgb), 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--accent-primary-rgb), 0.07) 1px, transparent 1px),
        linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
    background-size:
        100% 100%,
        120px 120px,
        120px 120px,
        30px 30px,
        30px 30px;
    box-shadow: inset 0 0 120px rgba(var(--accent-primary-rgb), 0.05);
}

[data-theme="dark"] .flow-container::before {
    opacity: 0.5;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(var(--accent-primary-rgb), 0.8) 20%,
        var(--accent-secondary) 55%,
        rgba(var(--accent-tertiary-rgb), 0.6) 78%,
        transparent 100%
    );
}

[data-theme="dark"] .flow-spine-dot {
    background: rgba(var(--accent-primary-rgb), 1);
    box-shadow:
        0 0 0 4px rgba(var(--accent-primary-rgb), 0.25),
        0 0 18px rgba(var(--accent-primary-rgb), 1),
        0 0 40px rgba(var(--accent-primary-rgb), 0.5);
}

/* ── Dark: Node boxes ── */
[data-theme="dark"] .step-box {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
    box-shadow:
        0 1px 2px rgba(0,0,0,0.5),
        0 4px 12px rgba(0,0,0,0.35),
        0 0 0 1px rgba(255,255,255,0.03) inset;
}

[data-theme="dark"] .step-box::after { display: none; }

[data-theme="dark"] .step-box:hover {
    background: var(--bg-tertiary);
    border-color: rgba(var(--accent-primary-rgb), 0.4);
    box-shadow:
        0 0 0 1px rgba(var(--accent-primary-rgb), 0.28),
        0 20px 50px rgba(var(--accent-primary-rgb), 0.22),
        0 8px 16px rgba(0,0,0,0.4);
}

[data-theme="dark"] .step-box::before {
    border-color: var(--bg-secondary);
    background: var(--border-dark);
}

/* ── Dark: Step types ── */
[data-theme="dark"] .step-type-start .step-box {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(var(--accent-success-rgb), 0.14));
    border-color: rgba(var(--accent-success-rgb), 0.45);
    box-shadow:
        0 0 0 5px rgba(var(--accent-success-rgb), 0.1),
        0 4px 16px rgba(var(--accent-success-rgb), 0.15);
}
[data-theme="dark"] .step-type-end .step-box {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(var(--accent-danger-rgb), 0.14));
    border-color: rgba(var(--accent-danger-rgb), 0.45);
    box-shadow:
        0 0 0 5px rgba(var(--accent-danger-rgb), 0.1),
        0 4px 16px rgba(var(--accent-danger-rgb), 0.15);
}
[data-theme="dark"] .step-type-highlight .step-box {
    background: linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.1), var(--bg-secondary));
    border-color: rgba(var(--accent-primary-rgb), 0.4);
    box-shadow: -4px 0 24px rgba(var(--accent-primary-rgb), 0.2);
}
[data-theme="dark"] .step-type-container .step-box {
    background: rgba(10, 17, 32, 0.75);
    border-color: var(--border-medium);
}
[data-theme="dark"] .step-type-decision .step-box {
    background: linear-gradient(135deg, rgba(30,41,59,0.9), rgba(var(--accent-warning-rgb), 0.16));
    filter:
        drop-shadow(0 0 12px rgba(var(--accent-warning-rgb), 0.55))
        drop-shadow(0 8px 28px rgba(var(--accent-warning-rgb), 0.25));
    animation: decisionPulse 3s ease-in-out infinite;
}
[data-theme="dark"] .step-type-decision .step-box:hover {
    filter:
        drop-shadow(0 0 22px rgba(var(--accent-warning-rgb), 0.75))
        drop-shadow(0 16px 48px rgba(var(--accent-warning-rgb), 0.35));
}
[data-theme="dark"] .step-type-annotation .step-box {
    background: linear-gradient(
        135deg,
        rgba(var(--accent-warning-rgb), 0.1) 0%,
        rgba(17,24,39,0.9) 65%
    );
    border-color: rgba(var(--accent-warning-rgb), 0.32);
    box-shadow: -4px 0 16px rgba(var(--accent-warning-rgb), 0.12);
}
[data-theme="dark"] .step-type-annotation .step-box:hover {
    border-color: rgba(var(--accent-warning-rgb), 0.6);
}

/* ── Dark: Step children ── */
[data-theme="dark"] .step-children {
    background: rgba(10, 17, 32, 0.6);
    border-color: var(--border-medium);
    box-shadow: inset 0 2px 12px rgba(0,0,0,0.4), inset 0 0 0 1px rgba(255,255,255,0.02);
}

/* ── Dark: Gallery cards ── */
[data-theme="dark"] .arch-card {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
    box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.04);
}
[data-theme="dark"] .arch-card:hover {
    background: var(--bg-tertiary);
    border-color: rgba(var(--accent-primary-rgb), 0.3);
    box-shadow:
        0 20px 48px rgba(var(--accent-primary-rgb), 0.18),
        0 8px 16px rgba(0,0,0,0.4),
        0 0 0 1px rgba(var(--accent-primary-rgb), 0.12);
}
[data-theme="dark"] .arch-card-meta-dot {
    box-shadow:
        0 0 0 3px rgba(var(--accent-success-rgb), 0.2),
        0 0 12px rgba(var(--accent-success-rgb), 0.85);
}

/* ── Dark: Parallel lanes ── */
[data-theme="dark"] .parallel-lane {
    background: rgba(10, 17, 32, 0.65);
    border-color: var(--border-medium);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,0.03);
}
[data-theme="dark"] .parallel-lane:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.28);
}
[data-theme="dark"] .parallel-step {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
    box-shadow: none;
}
[data-theme="dark"] .parallel-step:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.32);
    box-shadow: 0 0 0 1px rgba(var(--accent-primary-rgb), 0.1);
}
[data-theme="dark"] .parallel-lanes::before {
    background: linear-gradient(
        to bottom,
        transparent,
        var(--border-dark) 25%,
        var(--border-dark) 75%,
        transparent
    );
}

/* ── Dark: Step index badge ── */
[data-theme="dark"] .step-index {
    background: rgba(255,255,255,0.05);
    border-color: var(--border-medium);
    color: var(--text-muted);
}
[data-theme="dark"] .step-box:hover .step-index {
    background: rgba(var(--accent-primary-rgb), 0.15);
    border-color: rgba(var(--accent-primary-rgb), 0.3);
    color: rgba(var(--accent-primary-rgb), 0.9);
}

/* ── Dark: viz-header ── */
[data-theme="dark"] .viz-header::after { opacity: 0.7; }
[data-theme="dark"] .viz-header::before { opacity: 0.6; }
[data-theme="dark"] .viz-title {
    background: linear-gradient(135deg, var(--text-primary) 50%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ── Dark: Decision branch labels ── */
[data-theme="dark"] .decision-label-yes {
    background: rgba(var(--accent-success-rgb), 0.14);
    border-color: rgba(var(--accent-success-rgb), 0.35);
}
[data-theme="dark"] .decision-label-no {
    background: rgba(var(--accent-danger-rgb), 0.14);
    border-color: rgba(var(--accent-danger-rgb), 0.35);
}

/* ── Dark: Parallel header ── */
[data-theme="dark"] .parallel-header {
    background: rgba(255,255,255,0.04);
    border-color: var(--border-medium);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

/* ── Dark: Back button ── */
[data-theme="dark"] .viz-back-btn {
    background: rgba(255,255,255,0.05);
    border-color: rgba(255,255,255,0.1);
    color: var(--text-secondary);
    box-shadow: none;
}
[data-theme="dark"] .viz-back-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(var(--accent-primary-rgb), 0.45);
}

/* ── Dark: Step desc separator ── */
[data-theme="dark"] .step-desc {
    border-top-color: rgba(255,255,255,0.06);
}

/* ── Dark: Arch card meta ── */
[data-theme="dark"] .arch-card-meta {
    border-top-color: var(--border-medium);
}

/* ── Dark: Loop indicator ── */
[data-theme="dark"] .step-has-loop::after {
    border-color: rgba(var(--accent-secondary-rgb), 0.35);
}
[data-theme="dark"] .step-has-loop::before {
    border-left-color: rgba(var(--accent-secondary-rgb), 0.6);
    filter: drop-shadow(0 0 6px rgba(var(--accent-secondary-rgb), 0.5));
}