:root {
    --color-primary: var(--color-primary-600, #126160); /* Synchronized with Tailwind primary */
    --color-accent: var(--color-accent-500, #FFD700); /* Synchronized with Tailwind accent */
    --color-surface: var(--color-surface, #FFFFFF);
    --color-surface-elevated: color-mix(in srgb, var(--color-surface) 94%, transparent);
    --color-border: color-mix(in srgb, var(--color-primary) 14%, transparent);
    --color-success: #0ea46f;
    --color-warning: #d69d1a;
    --color-danger: #d64545;
    --color-muted: #5f6e77;

    --section-accent: var(--color-accent);

    --section-preparatory: color-mix(in srgb, var(--color-accent) 90%, var(--color-surface));
    --section-basic: #3b82f6;
    --section-daily: #10b981;
    --section-public: #8b5cf6;

    --section-understanding: color-mix(in srgb, #f59e0b 78%, var(--color-surface));
    --section-workplace: #3b82f6;
    --section-worklife: #10b981;
    --section-laws: #f59e0b;
    --section-safety: #8b5cf6;
}

:root.dark,
html.dark,
body.dark,
body.theme-dark,
html.theme-dark {
    --bg-main: #0B2F2E;
    --bg-surface: #154544;
    --bg-surface-hover: #1C5A58;
    --text-primary: #F5F7F6;
    --text-muted: #A7C3C1;
    --border: #2E6A68;

    --color-surface: var(--bg-surface);
    --color-surface-elevated: var(--bg-surface-hover);
    --color-border: var(--border);
    --color-muted: var(--text-muted);

    --section-preparatory: color-mix(in srgb, #b98912 74%, #1a2430);
    --section-basic: color-mix(in srgb, #2563eb 76%, #162131);
    --section-daily: color-mix(in srgb, #059669 78%, #14252f);
    --section-public: color-mix(in srgb, #7c3aed 76%, #161f31);

    --section-understanding: color-mix(in srgb, #c17e1a 78%, #1a2430);
    --section-workplace: color-mix(in srgb, #2563eb 76%, #162131);
    --section-worklife: color-mix(in srgb, #059669 78%, #14252f);
    --section-laws: color-mix(in srgb, #c17e1a 78%, #1f2532);
    --section-safety: color-mix(in srgb, #7c3aed 76%, #161f31);
}

.flashcards-shell {
    color: var(--color-muted);
}

.recommended-card {
    background: linear-gradient(150deg, color-mix(in srgb, var(--color-primary) 90%, transparent), color-mix(in srgb, var(--color-primary) 75%, var(--color-accent)));
    border: 1px solid color-mix(in srgb, var(--color-accent) 22%, transparent);
    border-radius: 1.5rem;
    box-shadow: 0 16px 26px -20px color-mix(in srgb, var(--color-primary) 55%, transparent);
    position: relative;
    overflow: hidden;
}

.recommended-card::after {
    content: '';
    position: absolute;
    right: -4.5rem;
    top: -4rem;
    width: 13rem;
    height: 13rem;
    border-radius: 9999px;
    background: radial-gradient(circle, color-mix(in srgb, var(--color-accent) 36%, transparent), transparent 70%);
}

.recommended-pill {
    border: 1px solid color-mix(in srgb, var(--color-accent) 30%, transparent);
    background: color-mix(in srgb, #ffffff 20%, transparent);
    color: #ffffff;
    font-size: 0.68rem;
    font-weight: 700;
    border-radius: 9999px;
    padding: 0.2rem 0.55rem;
}

.recommended-cta {
    min-height: 2.75rem;
    border-radius: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-accent);
    transition: transform 300ms ease, box-shadow 300ms ease, filter 300ms ease;
    box-shadow: 0 10px 20px -14px color-mix(in srgb, var(--color-accent) 68%, transparent);
}

.recommended-cta:hover {
    transform: translateY(-2px);
    filter: brightness(1.04);
}

.recommended-cta:active {
    transform: scale(0.98);
}

.section-block {
    --section-accent: var(--section-basic);
    --section-tint: color-mix(in srgb, var(--section-accent) 9%, var(--color-surface));
    --section-icon-bg: color-mix(in srgb, var(--section-accent) 16%, var(--color-surface));
    --section-border: color-mix(in srgb, var(--section-accent) 18%, transparent);
    --section-glow: color-mix(in srgb, var(--section-accent) 32%, transparent);
    position: relative;
    border-radius: 1.25rem;
    padding: 0.35rem;
}

.section-block::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background:
        radial-gradient(220px 110px at 12% 8%, color-mix(in srgb, var(--section-accent) 8%, transparent), transparent 66%),
        radial-gradient(260px 120px at 88% 88%, color-mix(in srgb, var(--section-accent) 6%, transparent), transparent 72%);
    pointer-events: none;
    opacity: 1;
}

.section-block.section-preparatory { --section-accent: var(--section-preparatory); }
.section-block.section-basic { --section-accent: var(--section-basic); }
.section-block.section-daily { --section-accent: var(--section-daily); }
.section-block.section-public { --section-accent: var(--section-public); }
.section-block.section-understanding { --section-accent: var(--section-understanding); }
.section-block.section-workplace { --section-accent: var(--section-workplace); }
.section-block.section-worklife { --section-accent: var(--section-worklife); }
.section-block.section-laws { --section-accent: var(--section-laws); }
.section-block.section-safety { --section-accent: var(--section-safety); }

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.section-title-wrap {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    position: relative;
    padding-bottom: 0.24rem;
}

.section-indicator {
    width: 0.36rem;
    height: 2.05rem;
    border-radius: 9999px;
    background: linear-gradient(180deg, var(--section-accent), color-mix(in srgb, var(--section-accent) 44%, var(--color-surface)));
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--section-accent) 24%, transparent);
}

.section-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: color-mix(in srgb, var(--color-primary) 88%, #0f172a);
}

.section-title-wrap::after {
    content: '';
    position: absolute;
    left: 0.98rem;
    right: 0;
    bottom: 0;
    height: 2px;
    border-radius: 9999px;
    background: linear-gradient(90deg, color-mix(in srgb, var(--section-accent) 64%, transparent), transparent);
    transform: scaleX(0.72);
    transform-origin: left;
    transition: transform 300ms ease;
}

.section-block:hover .section-title-wrap::after {
    transform: scaleX(1);
}

.section-path {
    position: relative;
    z-index: 1;
    margin-top: 0.4rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--section-border);
    border-radius: 0.95rem;
    background: color-mix(in srgb, var(--section-tint) 72%, transparent);
}

.section-path-top {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 0.38rem;
}

.section-path-label {
    font-size: 0.69rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: color-mix(in srgb, var(--color-muted) 94%, var(--color-surface));
}

.section-path-value {
    font-size: 0.76rem;
    font-weight: 800;
    color: color-mix(in srgb, var(--section-accent) 86%, #1f2937);
}

.section-path-track {
    height: 0.45rem;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--section-accent) 18%, transparent);
    position: relative;
    overflow: hidden;
}

.section-path-fill {
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, color-mix(in srgb, var(--section-accent) 80%, var(--color-surface)), var(--section-accent));
    transition: width 300ms ease;
}

.section-marker {
    position: absolute;
    top: -0.18rem;
    width: 2px;
    height: 0.82rem;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--section-accent) 42%, transparent);
}

.section-marker.m25 { left: 25%; }
.section-marker.m50 { left: 50%; }
.section-marker.m75 { left: 75%; }
.section-marker.m100 { right: 0; }

.lessons-grid {
    position: relative;
    z-index: 1;
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 0.92rem;
}

@media (min-width: 768px) {
    .lessons-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.lesson-card {
    --tile-color: #0F4D46;
    --tile-text: #FFFFFF;
    --tile-shadow: rgba(15, 77, 70, 0.48);
    position: relative;
    background: linear-gradient(135deg, color-mix(in srgb, var(--tile-color) 86%, #ffffff), color-mix(in srgb, var(--tile-color) 86%, #000000));
    border: 1px solid color-mix(in srgb, var(--tile-color) 82%, #ffffff);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.7rem;
    padding: 0.95rem;
    text-decoration: none;
    color: var(--tile-text);
    text-shadow: 0 1px 1px color-mix(in srgb, #000000 24%, transparent);
    transition: transform 300ms ease, box-shadow 300ms ease, border-color 300ms ease;
    box-shadow: 0 2px 0 color-mix(in srgb, #ffffff 18%, transparent), 0 14px 22px -12px var(--tile-shadow), 0 22px 36px -28px color-mix(in srgb, #0f172a 46%, transparent);
}

.lessons-grid .lesson-card:nth-child(5n + 1) {
    --tile-color: #0F4D46;
    --tile-text: #FFFFFF;
    --tile-shadow: rgba(15, 77, 70, 0.48);
}

.lessons-grid .lesson-card:nth-child(5n + 2) {
    --tile-color: #A40338;
    --tile-text: #FFFFFF;
    --tile-shadow: rgba(164, 3, 56, 0.44);
}

.lessons-grid .lesson-card:nth-child(5n + 3) {
    --tile-color: #AC8307;
    --tile-text: #FFFFFF;
    --tile-shadow: rgba(172, 131, 7, 0.46);
}

.lessons-grid .lesson-card:nth-child(5n + 4) {
    --tile-color: #503AAA;
    --tile-text: #FFFFFF;
    --tile-shadow: rgba(80, 58, 170, 0.5);
}

.lessons-grid .lesson-card:nth-child(5n + 5) {
    --tile-color: #BF3100;
    --tile-text: #FFFFFF;
    --tile-shadow: rgba(191, 49, 0, 0.5);
}

.lesson-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--tile-color) 72%, #ffffff);
    box-shadow: 0 2px 0 color-mix(in srgb, #ffffff 24%, transparent), 0 18px 26px -10px var(--tile-shadow), 0 30px 44px -28px color-mix(in srgb, #0f172a 54%, transparent);
}

.lesson-card:active {
    transform: scale(0.992);
}

.lesson-state-locked {
    opacity: 0.74;
    filter: grayscale(0.16);
}

.lesson-state-completed {
    border-color: color-mix(in srgb, var(--tile-color) 65%, #ffffff);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--tile-color) 20%, transparent), 0 12px 22px -12px var(--tile-shadow), 0 0 18px -10px color-mix(in srgb, var(--tile-color) 44%, transparent);
}

.lesson-state-inprogress {
    border-color: color-mix(in srgb, var(--tile-color) 52%, #ffffff);
}

.lesson-number {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 0.75rem;
    background: #ffffff;
    border: 2px solid var(--tile-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--tile-color);
}

.lesson-icon-badge {
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 0.78rem;
    border: 1px solid color-mix(in srgb, #ffffff 36%, transparent);
    background: color-mix(in srgb, #ffffff 20%, transparent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: transform 300ms ease;
}

.lesson-card:hover .lesson-icon-badge {
    transform: translateY(-1px) scale(1.05);
}

.lesson-title {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--tile-text);
    line-height: 1.3;
    letter-spacing: 0.01em;
}

.lesson-meta {
    font-size: 0.64rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 700;
    color: color-mix(in srgb, var(--tile-text) 84%, transparent);
}

.lesson-progress-wrap {
    margin-top: 0.34rem;
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.lesson-progress-track {
    flex: 1;
    height: 0.32rem;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--section-accent) 18%, transparent);
    overflow: hidden;
}

.lesson-progress-fill {
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, color-mix(in srgb, var(--section-accent) 84%, var(--color-surface)), var(--section-accent));
    transition: width 300ms ease;
}

.lesson-progress-text {
    font-size: 0.62rem;
    font-weight: 700;
    color: color-mix(in srgb, var(--section-accent) 84%, #1f2937);
    min-width: 2.1rem;
    text-align: right;
}

.lesson-right {
    min-width: 1.3rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.coming-soon-label {
    font-size: 0.58rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 700;
    color: color-mix(in srgb, var(--color-muted) 78%, var(--color-surface));
    border: 1px solid color-mix(in srgb, var(--section-accent) 15%, transparent);
    background: color-mix(in srgb, var(--color-surface-elevated) 80%, transparent);
    border-radius: 9999px;
    padding: 0.18rem 0.4rem;
}

.completion-check {
    width: 1.35rem;
    height: 1.35rem;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--section-accent) 24%, var(--color-surface));
    border: 1px solid color-mix(in srgb, var(--section-accent) 28%, transparent);
    color: color-mix(in srgb, var(--section-accent) 88%, #111827);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.progress-chip {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    font-size: 0.56rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 800;
    color: color-mix(in srgb, var(--section-accent) 90%, #1f2937);
    border: 1px solid color-mix(in srgb, var(--section-accent) 24%, transparent);
    background: color-mix(in srgb, var(--section-accent) 16%, var(--color-surface));
    border-radius: 9999px;
    padding: 0.14rem 0.4rem;
}

.xp-toaster {
    position: fixed;
    bottom: 5.3rem;
    right: 1rem;
    z-index: 90;
    min-width: 190px;
    border-radius: 0.95rem;
    border: 1px solid color-mix(in srgb, var(--color-accent) 28%, transparent);
    background: color-mix(in srgb, var(--color-surface-elevated) 94%, transparent);
    box-shadow: 0 14px 24px -18px color-mix(in srgb, var(--color-primary) 45%, transparent);
    padding: 0.72rem 0.82rem;
    opacity: 0;
    transform: translateY(8px);
    pointer-events: none;
    transition: opacity 300ms ease, transform 300ms ease;
}

.xp-toaster.visible {
    opacity: 1;
    transform: translateY(0);
}

.multiplier-badge {
    font-size: 0.62rem;
    border-radius: 9999px;
    padding: 0.15rem 0.46rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border: 1px solid color-mix(in srgb, var(--color-accent) 30%, transparent);
    background: color-mix(in srgb, var(--color-accent) 17%, transparent);
    color: color-mix(in srgb, var(--color-accent) 88%, #1f2937);
}

.multiplier-badge.flame {
    box-shadow: 0 0 16px color-mix(in srgb, var(--color-accent) 26%, transparent);
    animation: flameGlow 300ms ease;
}

@keyframes flameGlow {
    0% { transform: scale(0.92); }
    100% { transform: scale(1); }
}

.reward-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(7, 12, 18, 0.38);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.reward-modal-backdrop.show {
    display: flex;
}

.reward-modal {
    width: min(92vw, 420px);
    border-radius: 1.2rem;
    border: 1px solid color-mix(in srgb, var(--section-accent) 24%, transparent);
    background: color-mix(in srgb, var(--color-surface) 96%, transparent);
    box-shadow: 0 20px 30px -22px color-mix(in srgb, var(--section-accent) 45%, transparent);
    padding: 1.2rem;
    transform: scale(0.96);
    opacity: 0;
    transition: transform 300ms ease, opacity 300ms ease;
    position: relative;
    overflow: hidden;
}

.reward-modal-backdrop.show .reward-modal {
    transform: scale(1);
    opacity: 1;
}

.reward-badge {
    width: 3rem;
    height: 3rem;
    border-radius: 1rem;
    border: 1px solid color-mix(in srgb, var(--section-accent) 26%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    background: color-mix(in srgb, var(--section-accent) 18%, var(--color-surface));
}

.modal-cta {
    min-height: 2.65rem;
    border-radius: 0.8rem;
    border: 1px solid color-mix(in srgb, var(--section-accent) 24%, transparent);
    background: color-mix(in srgb, var(--section-accent) 16%, var(--color-surface));
    color: color-mix(in srgb, var(--section-accent) 86%, #111827);
    font-weight: 800;
    transition: all 300ms ease;
}

.modal-cta:hover {
    filter: brightness(1.03);
}

.confetti-wrap {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 6px;
    height: 10px;
    border-radius: 2px;
    opacity: 0;
    transform: translateY(-12px);
    animation: confettiFall 580ms ease forwards;
}

@keyframes confettiFall {
    0% { opacity: 0; transform: translateY(-12px) rotate(0deg); }
    12% { opacity: 1; }
    100% { opacity: 0; transform: translateY(88px) rotate(180deg); }
}

@media (max-width: 768px) {
    .lesson-card:active {
        transform: scale(0.985);
    }
}

@media (prefers-reduced-motion: reduce) {
    .recommended-cta,
    .section-title-wrap::after,
    .section-path-fill,
    .lesson-card,
    .lesson-icon-badge,
    .lesson-progress-fill,
    .xp-toaster,
    .reward-modal,
    .confetti {
        transition: none !important;
        animation: none !important;
    }
}