/* ==========================================================================
   ACHIEVEMENTS PAGE — SPECIFIC STYLES
   Covers: stats bar, filter pill, cert grid, cert cards, light mode overrides.
   All values use CSS variables so both themes work automatically.
   ========================================================================== */


/* ==========================================================================
   1. PAGE LAYOUT — section padding
   !important is kept here intentionally: these rules must win over the
   global .section rule without touching styles.css.
   ========================================================================== */


main .section {
    padding: 0 2rem !important;
}

/* FIX 9: Use --header-h token defined in styles.css :root instead of
   a magic 80px. When main.js changes the header height (e.g. via
   JS-driven resize), updating --header-h is the only change needed. */
main > .section:first-of-type {
    padding-top: calc(var(--header-h) + 1.5rem) !important;
    padding-bottom: 1rem !important;
}

.section-header {
    margin-bottom: 2rem;
}

@media (max-width: 600px) {
    main > .section:first-of-type {
        /* Extra buffer on small screens where the nav may wrap. */
        padding-top: calc(var(--header-h) + 2rem) !important;
    }
}


/* ==========================================================================
   2. STATS BAR
   ========================================================================== */

.stats-bar {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    padding: 0 2rem;
}

.stat-box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.3));
    transition:
        transform        0.3s ease,
        border-color     0.3s ease,
        box-shadow       0.3s ease,
        background-color 0.3s ease;
}

.stat-box::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #00e8c8, #00ffcc);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    border-radius: 0 0 16px 16px;
}

.stat-box:hover::after {
    transform: scaleX(1);
}

.stat-box:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow:
        var(--shadow-md, 0 8px 24px rgba(0,0,0,0.4)),
        0 0 20px var(--glow);
}

/* E7: Terminal-glow on the big stat numbers — crisp against dark bg,
   carries the cyberpunk energy of the rest of the page. */
.stat-number {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.25rem;
    line-height: 1;
    text-shadow: 0 0 22px rgba(0, 217, 181, 0.38);
    transition: text-shadow 0.3s ease, color 0.3s ease;
}

.stat-text {
    font-size: 0.85rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

@media (max-width: 600px) {
    .stats-bar     { gap: 1rem; }
    .stat-box      { width: 100%; max-width: 300px; }
}


/* ==========================================================================
   3. FILTER PILL
   ========================================================================== */

.filter-section {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    padding: 0 2rem;
}

.filter-container {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    background: var(--bg-secondary);
    padding: 0.5rem;
    border-radius: 50px;
    border: 1px solid var(--border);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.filter-btn {
    background: transparent;
    border: none;
    color: var(--muted);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: color 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.filter-btn:hover {
    color: var(--fg);
    background: var(--accent-dim);
}

/* Active: white text explicitly — correct on both dark and light card bg. */
.filter-btn.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 0 15px var(--glow);
}

@media (max-width: 600px) {
    .filter-container {
        border-radius: 16px;
        padding: 0.75rem;
    }
}


/* ==========================================================================
   4. CERTIFICATE GRID
   ========================================================================== */

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem 4rem;
}

@media (max-width: 600px) {
    .cert-grid { grid-template-columns: 1fr; }
}

/* Cards injected by JS after IntersectionObserver fires — force visible. */
.cert-card.reveal {
    opacity: 1 !important;
    transform: translateY(0) !important;
}


/* ==========================================================================
   5. CERTIFICATE CARD
   ========================================================================== */

/* FIX 10: Explicit fallback background before the color-mix() gradient
   for browsers that don't support color-mix (Firefox < 113, Safari < 16.2).
   Those browsers render the solid --card color; newer browsers get the gradient. */
.cert-card {
    background: var(--card);
    background: linear-gradient(
        145deg,
        var(--card) 0%,
        color-mix(in srgb, var(--bg-secondary) 80%, transparent) 100%
    );
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.75rem;
    padding-top: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.3));
    transition:
        transform    0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        border-color 0.3s ease,
        box-shadow   0.3s ease,
        background   0.3s ease;
}

/* E3: Animated ribbon shimmer — background-position slides every 3s,
   creating a premium sweep effect that loops seamlessly. */
.cert-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(
        90deg,
        var(--accent),
        #00e8c8,
        #00ffcc,
        #00e8c8,
        var(--accent)
    );
    background-size: 300% 100%;
    border-radius: 16px 16px 0 0;
    z-index: 2;
    animation: ribbon-shimmer 4s linear infinite;
}

@keyframes ribbon-shimmer {
    0%   { background-position: 0%   center; }
    100% { background-position: 300% center; }
}

/* Star watermark */
.cert-card::after {
    content: '★';
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 2.5rem;
    color: var(--accent);
    opacity: 0.08;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: rotate(15deg);
    z-index: 0;
    pointer-events: none;
}

/* FIX 11: Use var(--accent) with an alpha-modified approach via the
   glow token instead of hardcoded hex — adapts to theme changes.
   The border fully uses var(--accent) since border-opacity isn't a
   standalone property; we add a slight transparency via box-shadow instead. */
.cert-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow:
        var(--shadow-lg, 0 16px 48px rgba(0,0,0,0.4)),
        0 0 30px var(--glow),
        inset 0 0 0 1px rgba(0, 217, 181, 0.08);
}

.cert-card:hover::after {
    opacity: 0.25;
    transform: rotate(0deg) scale(1.1);
}


/* ==========================================================================
   6. CARD INTERIOR ELEMENTS
   ========================================================================== */

.cert-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    gap: 0.5rem;
}

.cert-issuer {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    border-radius: 4px;
    padding: 0.25rem 0.75rem;
    /* Gold — intentional non-theme color, same in both modes.
       Alpha bg + border so it reads on dark card AND white card. */
    color: #c89b2a;
    background: rgba(200, 155, 42, 0.10);
    border: 1px solid rgba(200, 155, 42, 0.25);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
    white-space: nowrap;
}

.cert-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--muted);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    white-space: nowrap;
    flex-shrink: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.cert-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.4;
    color: var(--fg);
    position: relative;
    z-index: 1;
    transition: color 0.3s ease;
}

.cert-id {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--muted);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.cert-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding-top: 1.25rem;
    position: relative;
    z-index: 1;
    transition: border-color 0.3s ease;
}

.cert-link {
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: color 0.3s ease, gap 0.3s ease, filter 0.3s ease;
}

.cert-link:hover {
    gap: 0.75rem;
    filter: brightness(1.15);
}

.cert-link svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.cert-link:hover svg {
    transform: translateX(3px);
}


/* ══════════════════════════════════════════════════════════════════════════
   LIGHT MODE OVERRIDES
   ══════════════════════════════════════════════════════════════════════════ */

[data-theme="light"] .stat-box {
    background: var(--card);
    border-color: var(--border);
    box-shadow: var(--shadow-sm);
}
[data-theme="light"] .stat-box:hover {
    box-shadow: var(--shadow-md), 0 0 20px var(--glow);
    border-color: var(--accent);
}
[data-theme="light"] .stat-box::after {
    background: linear-gradient(90deg, var(--accent), #00b89e, #00c4a0);
}
/* In light mode the glow would wash out on white — drop it to zero. */
[data-theme="light"] .stat-number {
    color: var(--accent);
    text-shadow: none;
}
[data-theme="light"] .stat-text { color: var(--muted); }

[data-theme="light"] .filter-container {
    background: var(--bg-secondary);
    border-color: var(--border);
}
[data-theme="light"] .filter-btn { color: var(--muted); }
[data-theme="light"] .filter-btn:hover {
    color: var(--fg);
    background: var(--accent-dim);
}
[data-theme="light"] .filter-btn.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 0 15px var(--glow);
}

[data-theme="light"] .cert-card {
    background: var(--card);
    background: linear-gradient(
        145deg,
        var(--card) 0%,
        #f6f8fc 100%
    );
    border-color: var(--border);
    box-shadow: var(--shadow-sm);
}
[data-theme="light"] .cert-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-lg), 0 0 30px var(--glow), inset 0 0 0 1px rgba(0, 158, 140, 0.08);
}
[data-theme="light"] .cert-card::before {
    background: linear-gradient(
        90deg,
        var(--accent),
        #00b89e,
        #00c4a0,
        #00b89e,
        var(--accent)
    );
    background-size: 300% 100%;
    /* Reuse the same keyframe — no duplication needed. */
}
[data-theme="light"] .cert-card::after { opacity: 0.06; }
[data-theme="light"] .cert-card:hover::after { opacity: 0.18; }

/* Darker gold for WCAG AA contrast on white card */
[data-theme="light"] .cert-issuer {
    color: #9a7510;
    background: rgba(154, 117, 16, 0.10);
    border-color: rgba(154, 117, 16, 0.25);
}

[data-theme="light"] .cert-date,
[data-theme="light"] .cert-id {
    background: var(--bg-secondary);
    border-color: var(--border);
    color: var(--muted);
}

[data-theme="light"] .cert-title   { color: var(--fg);     }
[data-theme="light"] .cert-footer  { border-top-color: var(--border); }
[data-theme="light"] .cert-link    { color: var(--accent); }


/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
    .stat-box,
    .cert-card,
    .filter-btn,
    .cert-link,
    .cert-link svg,
    .stat-box::after,
    .cert-card::after {
        transition-duration: 0.01ms !important;
    }

    /* Stop the ribbon shimmer and ribbon-slide */
    .cert-card::before {
        animation: none;
    }

    .cert-card:hover,
    .stat-box:hover {
        transform: none;
    }
}