@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Titillium+Web:wght@400;600;700&display=swap');

/* ============================================
   Factorio Theme Specific Styles
   Industrial automation aesthetic
   ============================================ */
[data-theme="factorio-dark"] {
    --factorio-yellow: #ffd54f;
    --factorio-iron: #5a5a5d;
    font-family: 'Titillium Web', sans-serif;
}

[data-theme="factorio-dark"] h1,
[data-theme="factorio-dark"] h2,
[data-theme="factorio-dark"] .module-num,
[data-theme="factorio-dark"] .track-title,
[data-theme="factorio-dark"] .session-title {
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    letter-spacing: 0.02em;
}

[data-theme="factorio-dark"] .code-block,
[data-theme="factorio-dark"] code,
[data-theme="factorio-dark"] .session-countdown,
[data-theme="factorio-dark"] .stat-value {
    font-family: 'Share Tech Mono', 'JetBrains Mono', monospace;
}

/* Industrial grid background with subtle noise texture */
[data-theme="factorio-dark"] body {
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 32px,
            rgba(58, 58, 61, 0.025) 32px,
            rgba(58, 58, 61, 0.025) 33px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 32px,
            rgba(58, 58, 61, 0.025) 32px,
            rgba(58, 58, 61, 0.025) 33px
        ),
        radial-gradient(ellipse at 50% 0%, rgba(252, 163, 17, 0.03) 0%, transparent 60%),
        var(--bg-dark);
}

/* Factorio-style beveled panels - like entity info windows */
[data-theme="factorio-dark"] .module-card,
[data-theme="factorio-dark"] .card,
[data-theme="factorio-dark"] .stat-card,
[data-theme="factorio-dark"] .exercise {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #242427 0%, #1e1e20 100%);
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10,
        0 4px 8px rgba(0, 0, 0, 0.4);
    position: relative;
}

/* Corner rivets/bolts decoration */
[data-theme="factorio-dark"] .module-card::before,
[data-theme="factorio-dark"] .module-card::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background: radial-gradient(circle at 30% 30%, #5a5a5d 0%, #2a2a2d 60%, #1a1a1d 100%);
    border-radius: 50%;
    box-shadow: inset 0 1px 1px rgba(255,255,255,0.15);
}

[data-theme="factorio-dark"] .module-card::before {
    top: 8px;
    left: 8px;
}

[data-theme="factorio-dark"] .module-card::after {
    top: 8px;
    right: 8px;
}

/* Orange glow line on hover */
[data-theme="factorio-dark"] .module-card {
    overflow: visible;
}

[data-theme="factorio-dark"] .module-card:hover {
    box-shadow:
        inset 1px 1px 0 #4a4a4d,
        inset -1px -1px 0 #0f0f10,
        0 0 0 1px var(--orange),
        0 0 20px rgba(252, 163, 17, 0.15),
        0 6px 12px rgba(0, 0, 0, 0.5);
    transform: translateY(-2px);
}

/* Inserter-style tier badge for module numbers */
[data-theme="factorio-dark"] .module-number {
    background: linear-gradient(180deg, #3a3a3d 0%, #2a2a2d 100%);
    border: 1px solid #4a4a4d;
    padding: 0.2rem 0.5rem;
    display: inline-block;
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.1),
        0 2px 4px rgba(0,0,0,0.3);
}

[data-theme="factorio-dark"] .module-number::before {
    content: none;
}

/* Conveyor belt-style progress bars with items */
[data-theme="factorio-dark"] .session-progress {
    background: linear-gradient(180deg, #1a1a1c 0%, #131314 100%);
    border: none;
    box-shadow:
        inset 1px 1px 0 #0a0a0b,
        inset -1px -1px 0 #2a2a2d;
    border-radius: 0;
    height: 12px;
    position: relative;
    overflow: hidden;
}

/* Belt texture background */
[data-theme="factorio-dark"] .session-progress::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 6px,
        rgba(255, 213, 79, 0.05) 6px,
        rgba(255, 213, 79, 0.05) 12px
    );
    animation: factorio-belt-bg 0.3s linear infinite;
}

[data-theme="factorio-dark"] .session-progress-bar {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%) !important;
    position: relative;
    overflow: hidden;
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.3),
        inset 0 -1px 0 rgba(0,0,0,0.2);
}

/* Moving belt lines */
[data-theme="factorio-dark"] .session-progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: -200%;
    width: 400%;
    height: 100%;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 10px,
        rgba(0, 0, 0, 0.12) 10px,
        rgba(0, 0, 0, 0.12) 12px
    );
    animation: factorio-belt 0.25s linear infinite;
}

/* Items on belt */
[data-theme="factorio-dark"] .session-progress-bar::after {
    content: '';
    position: absolute;
    top: 2px;
    left: -100%;
    width: 300%;
    height: 8px;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 28px,
        #63c74d 28px,
        #63c74d 36px,
        transparent 36px,
        transparent 64px,
        #ce6a32 64px,
        #ce6a32 72px
    );
    animation: factorio-items 1.5s linear infinite;
    opacity: 0.6;
}

@keyframes factorio-belt {
    0% { transform: translateX(0); }
    100% { transform: translateX(12px); }
}

@keyframes factorio-belt-bg {
    0% { transform: translateX(0); }
    100% { transform: translateX(12px); }
}

@keyframes factorio-items {
    0% { transform: translateX(0); }
    100% { transform: translateX(72px); }
}

/* Industrial code blocks - blueprint style */
[data-theme="factorio-dark"] .code-block,
[data-theme="factorio-dark"] .code-labeled,
[data-theme="factorio-dark"] .lesson pre {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #161618 0%, #131314 100%);
    box-shadow:
        inset 1px 1px 0 #0a0a0b,
        inset -1px -1px 0 #2a2a2d,
        0 4px 8px rgba(0, 0, 0, 0.3);
    position: relative;
}
[data-theme="factorio-dark"] .code-compare {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #161618 0%, #131314 100%);
    box-shadow:
        inset 1px 1px 0 #0a0a0b,
        inset -1px -1px 0 #2a2a2d,
        0 4px 8px rgba(0, 0, 0, 0.3);
}
[data-theme="factorio-dark"] .code-compare .code-labeled {
    border: none;
    box-shadow: none;
    background: transparent;
}

/* Left accent bar */
[data-theme="factorio-dark"] .code-block::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--orange) 0%, #d48806 100%);
}

[data-theme="factorio-dark"] .code-header {
    background: linear-gradient(180deg, #28282b 0%, #1e1e20 100%) !important;
    border: none !important;
    border-bottom: 1px solid #0a0a0b !important;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
    font-family: 'Titillium Web', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--text-dim) !important;
}

/* Inline code - green circuit style */
[data-theme="factorio-dark"] code:not(.code-block code):not(pre code) {
    background: linear-gradient(180deg, rgba(99, 199, 77, 0.15) 0%, rgba(99, 199, 77, 0.08) 100%);
    border: 1px solid rgba(99, 199, 77, 0.25);
    box-shadow: inset 0 1px 0 rgba(99, 199, 77, 0.1);
    color: #63c74d;
    border-radius: 0;
    padding: 0.15rem 0.4rem;
}

/* Tips/Warnings - Factorio alert panel style */
[data-theme="factorio-dark"] .tip,
[data-theme="factorio-dark"] .warning,
[data-theme="factorio-dark"] .info {
    border-radius: 0;
    border: none;
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    box-shadow:
        inset 1px 1px 0 #2a2a2d,
        inset -1px -1px 0 #0f0f10,
        0 2px 6px rgba(0, 0, 0, 0.3);
    position: relative;
    padding-left: 3rem;
}

/* Alert icon area */
[data-theme="factorio-dark"] .tip::after,
[data-theme="factorio-dark"] .warning::after,
[data-theme="factorio-dark"] .info::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="factorio-dark"] .tip {
    border-left: 4px solid #63c74d;
}

[data-theme="factorio-dark"] .tip::after {
    background: linear-gradient(180deg, rgba(99, 199, 77, 0.15) 0%, rgba(99, 199, 77, 0.08) 100%);
    border-right: 1px solid rgba(99, 199, 77, 0.2);
}

[data-theme="factorio-dark"] .tip::before {
    color: #63c74d !important;
}

[data-theme="factorio-dark"] .warning {
    border-left: 4px solid var(--orange);
    background: linear-gradient(180deg, #1e1e20 0%, rgba(252, 163, 17, 0.03) 100%);
}

[data-theme="factorio-dark"] .warning::after {
    background: linear-gradient(180deg, rgba(252, 163, 17, 0.15) 0%, rgba(252, 163, 17, 0.08) 100%);
    border-right: 1px solid rgba(252, 163, 17, 0.2);
}

[data-theme="factorio-dark"] .warning::before {
    color: var(--orange) !important;
}

[data-theme="factorio-dark"] .info {
    border-left: 4px solid var(--blue);
}

[data-theme="factorio-dark"] .info::after {
    background: linear-gradient(180deg, rgba(58, 134, 201, 0.15) 0%, rgba(58, 134, 201, 0.08) 100%);
    border-right: 1px solid rgba(58, 134, 201, 0.2);
}

[data-theme="factorio-dark"] .info::before {
    color: var(--blue) !important;
}

/* Industrial nav buttons - machine button style */
[data-theme="factorio-dark"] .nav-btn {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #2d2d30 0%, #232326 100%);
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10,
        0 2px 4px rgba(0, 0, 0, 0.3);
    font-family: 'Titillium Web', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
    transition: all 0.1s ease;
}

[data-theme="factorio-dark"] .nav-btn:hover {
    background: linear-gradient(180deg, #3a3a3d 0%, #2d2d30 100%);
    box-shadow:
        inset 1px 1px 0 #4a4a4d,
        inset -1px -1px 0 #1a1a1c,
        0 0 0 1px var(--orange),
        0 4px 8px rgba(0, 0, 0, 0.4);
}

[data-theme="factorio-dark"] .nav-btn:active {
    background: linear-gradient(180deg, #1e1e20 0%, #28282b 100%);
    box-shadow:
        inset 1px 1px 0 #0f0f10,
        inset -1px -1px 0 #2a2a2d;
}

[data-theme="factorio-dark"] .nav-btn.primary {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 2px 4px rgba(0, 0, 0, 0.3);
}

[data-theme="factorio-dark"] .nav-btn.primary:hover {
    background: linear-gradient(180deg, #ffe082 0%, #ffd54f 50%, #fca311 100%);
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.5),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 15px rgba(252, 163, 17, 0.4),
        0 4px 8px rgba(0, 0, 0, 0.4);
}

/* Industrial sidebar - left panel style */
[data-theme="factorio-dark"] .sidebar {
    background: linear-gradient(90deg, #161618 0%, #1a1a1c 100%);
    border-right: none;
    box-shadow:
        inset -1px 0 0 #2a2a2d,
        4px 0 12px rgba(0, 0, 0, 0.4);
}

[data-theme="factorio-dark"] .sidebar-header {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    border-bottom: 1px solid #0f0f10 !important;
    box-shadow: inset 0 -1px 0 #2a2a2d;
}

[data-theme="factorio-dark"] .sidebar-link {
    border-left: 3px solid transparent;
    transition: all 0.1s ease;
    margin: 0 4px;
}

[data-theme="factorio-dark"] .sidebar-link:hover {
    background: linear-gradient(90deg, rgba(252, 163, 17, 0.1) 0%, transparent 100%);
    border-left-color: var(--orange);
}

[data-theme="factorio-dark"] .sidebar-link.active {
    background: linear-gradient(90deg, rgba(252, 163, 17, 0.15) 0%, transparent 100%);
    border-left-color: var(--orange);
    color: var(--orange);
    box-shadow: inset 0 1px 0 rgba(252, 163, 17, 0.1), inset 0 -1px 0 rgba(252, 163, 17, 0.1);
}

[data-theme="factorio-dark"] .sidebar-module-num {
    color: var(--orange);
    opacity: 1;
    font-weight: 600;
}

/* Session timer - entity info panel style */
[data-theme="factorio-dark"] .session-timer,
[data-theme="factorio-dark"] .floating-session-timer {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    box-shadow:
        inset 1px 1px 0 #2a2a2d,
        inset -1px -1px 0 #0f0f10,
        0 6px 16px rgba(0, 0, 0, 0.5);
}

/* Timer header bar */
[data-theme="factorio-dark"] .session-timer-header {
    background: linear-gradient(180deg, #28282b 0%, #1e1e20 100%);
    margin: -1rem -1.25rem 0.75rem -1.25rem;
    padding: 0.6rem 1.25rem;
    border-bottom: 1px solid #0f0f10;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}

[data-theme="factorio-dark"] .session-title {
    color: var(--text-dim);
    font-weight: 600;
}

[data-theme="factorio-dark"] .session-countdown {
    color: var(--factorio-yellow);
    text-shadow: 0 0 8px rgba(255, 213, 79, 0.4);
    font-size: 1.2rem;
}

/* Stat values - digital readout style */
[data-theme="factorio-dark"] .stat-value {
    color: var(--factorio-yellow);
    text-shadow:
        0 0 10px rgba(255, 213, 79, 0.4),
        0 0 20px rgba(255, 213, 79, 0.2);
    letter-spacing: 0.05em;
}

[data-theme="factorio-dark"] .stat-card {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
}

/* Links - copper wire orange */
[data-theme="factorio-dark"] a {
    color: var(--orange);
    transition: all 0.1s ease;
}

[data-theme="factorio-dark"] a:hover {
    color: var(--factorio-yellow);
    text-shadow: 0 0 8px rgba(252, 163, 17, 0.3);
}

[data-theme="factorio-dark"] .breadcrumb a {
    color: var(--orange);
}

/* Exercise blocks - workbench style */
[data-theme="factorio-dark"] .exercise {
    border-left: 4px solid var(--orange);
    padding-left: 2rem;
}

[data-theme="factorio-dark"] .exercise-header h3 {
    color: var(--orange) !important;
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Module headers - research panel style */
[data-theme="factorio-dark"] .module-tag {
    color: var(--orange);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.75rem;
    background: linear-gradient(180deg, rgba(252, 163, 17, 0.15) 0%, rgba(252, 163, 17, 0.05) 100%);
    padding: 0.3rem 0.8rem;
    display: inline-block;
    border-left: 3px solid var(--orange);
}

[data-theme="factorio-dark"] h1 {
    color: var(--text-main);
    position: relative;
}

[data-theme="factorio-dark"] h1::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--orange) 0%, var(--factorio-yellow) 50%, transparent 100%);
    margin-top: 0.75rem;
}

[data-theme="factorio-dark"] h2 {
    border-bottom: 1px solid #2a2a2d;
    padding-bottom: 0.6rem;
    position: relative;
}

[data-theme="factorio-dark"] h2::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--orange);
}

/* Scrollbar - belt-like */
[data-theme="factorio-dark"] ::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

[data-theme="factorio-dark"] ::-webkit-scrollbar-track {
    background: linear-gradient(90deg, #0f0f10 0%, #1a1a1c 50%, #0f0f10 100%);
    border: 1px solid #2a2a2d;
}

[data-theme="factorio-dark"] ::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #3a3a3d 0%, #2d2d30 100%);
    border: 1px solid #4a4a4d;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
}

[data-theme="factorio-dark"] ::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--orange) 0%, #d48806 100%);
    border-color: var(--factorio-yellow);
}

[data-theme="factorio-dark"] ::-webkit-scrollbar-corner {
    background: #131314;
}

/* Selection */
[data-theme="factorio-dark"] ::selection {
    background: var(--orange);
    color: #131314;
}

/* Buttons - machine control style */
[data-theme="factorio-dark"] button:not(.sidebar-toggle),
[data-theme="factorio-dark"] .quick-btn,
[data-theme="factorio-dark"] .session-control-btn,
[data-theme="factorio-dark"] .data-btn {
    font-family: 'Titillium Web', sans-serif;
    font-weight: 600;
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #2d2d30 0%, #232326 100%);
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.75rem;
    transition: all 0.1s ease;
}

[data-theme="factorio-dark"] button:not(.sidebar-toggle):hover,
[data-theme="factorio-dark"] .quick-btn:hover,
[data-theme="factorio-dark"] .session-control-btn:hover,
[data-theme="factorio-dark"] .data-btn:hover {
    background: linear-gradient(180deg, #3a3a3d 0%, #2d2d30 100%);
    box-shadow:
        inset 1px 1px 0 #4a4a4d,
        inset -1px -1px 0 #1a1a1c,
        0 0 0 1px var(--orange);
    color: var(--orange);
}

[data-theme="factorio-dark"] .quick-btn.primary {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2);
}

[data-theme="factorio-dark"] .quick-btn.primary:hover {
    background: linear-gradient(180deg, #ffe082 0%, #ffd54f 50%, #fca311 100%);
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.5),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 12px rgba(252, 163, 17, 0.4);
    color: #131314;
}

/* Option buttons (flashcards, daily practice) - active state must override base button styles */
[data-theme="factorio-dark"] .dp-option.active {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 8px rgba(252, 163, 17, 0.3);
}

/* Track titles - production panel header */
[data-theme="factorio-dark"] .track-header {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    margin: 0 -2rem 1.5rem -2rem;
    padding: 1rem 2rem;
    border-bottom: none;
    box-shadow:
        inset 0 1px 0 #2a2a2d,
        inset 0 -1px 0 #0f0f10,
        0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="factorio-dark"] .track-name {
    color: var(--orange);
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Topic tags - item badge style */
[data-theme="factorio-dark"] .topic-tag {
    background: linear-gradient(180deg, #2d2d30 0%, #232326 100%);
    border: none;
    border-radius: 0;
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10;
    color: var(--text-dim);
    font-weight: 500;
}

[data-theme="factorio-dark"] .project-tag {
    background: linear-gradient(180deg, rgba(252, 163, 17, 0.2) 0%, rgba(252, 163, 17, 0.1) 100%);
    color: var(--orange);
    box-shadow:
        inset 1px 1px 0 rgba(252, 163, 17, 0.3),
        inset -1px -1px 0 rgba(0, 0, 0, 0.2);
}

/* Module checkbox - inserter checkbox style */
[data-theme="factorio-dark"] .module-checkbox {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #1a1a1c 0%, #131314 100%);
    box-shadow:
        inset 1px 1px 0 #0f0f10,
        inset -1px -1px 0 #2a2a2d;
}

[data-theme="factorio-dark"] .module-checkbox:checked {
    background: linear-gradient(180deg, #63c74d 0%, #3e8948 100%);
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.3),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 8px rgba(99, 199, 77, 0.4);
}

/* Hero section adjustments */
[data-theme="factorio-dark"] .hero-stats {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    border: none;
    border-radius: 0;
    box-shadow:
        inset 1px 1px 0 #2a2a2d,
        inset -1px -1px 0 #0f0f10,
        0 4px 12px rgba(0, 0, 0, 0.4);
}

[data-theme="factorio-dark"] h1.hero-title {
    background: linear-gradient(135deg, var(--factorio-yellow) 0%, var(--orange) 50%, #ce6a32 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="factorio-dark"] h1.hero-title::after {
    display: none;
}

/* Start button - big factory button */
[data-theme="factorio-dark"] .start-btn {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    border: none;
    border-radius: 0;
    box-shadow:
        inset 2px 2px 0 rgba(255,255,255,0.4),
        inset -2px -2px 0 rgba(0,0,0,0.2),
        0 4px 8px rgba(0, 0, 0, 0.4);
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

[data-theme="factorio-dark"] .start-btn:hover {
    background: linear-gradient(180deg, #ffe082 0%, #ffd54f 50%, #fca311 100%);
    box-shadow:
        inset 2px 2px 0 rgba(255,255,255,0.5),
        inset -2px -2px 0 rgba(0,0,0,0.2),
        0 0 20px rgba(252, 163, 17, 0.5),
        0 6px 12px rgba(0, 0, 0, 0.5);
}

/* Daily practice buttons — override the global button reset */
[data-theme="factorio-dark"] button.dp-start-btn {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2);
}
[data-theme="factorio-dark"] button.dp-start-btn:hover {
    background: linear-gradient(180deg, #ffe082 0%, #ffd54f 50%, #fca311 100%);
    filter: none;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.5),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 12px rgba(252, 163, 17, 0.4);
}
[data-theme="factorio-dark"] button.dp-next-btn {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2);
}
[data-theme="factorio-dark"] button.dp-next-btn:hover {
    background: linear-gradient(180deg, #ffe082 0%, #ffd54f 50%, #fca311 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.5),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 12px rgba(252, 163, 17, 0.4);
}
[data-theme="factorio-dark"] button.dp-skip-btn {
    border: 1px solid #3a3a3d;
    color: var(--text-dim);
}
[data-theme="factorio-dark"] button.dp-skip-btn:hover {
    border-color: var(--orange);
    color: var(--orange);
    box-shadow: 0 0 8px rgba(252, 163, 17, 0.2);
}

/* Philosophy section */
[data-theme="factorio-dark"] .philosophy {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    border: none;
    border-radius: 0;
    box-shadow:
        inset 1px 1px 0 #2a2a2d,
        inset -1px -1px 0 #0f0f10,
        0 4px 12px rgba(0, 0, 0, 0.4);
}

[data-theme="factorio-dark"] .philosophy h2 {
    color: var(--orange);
    border-bottom: none;
}

[data-theme="factorio-dark"] .philosophy h2::after {
    display: none;
}

[data-theme="factorio-dark"] .philosophy-item h3 {
    color: var(--factorio-yellow);
}

/* Lesson cards */
[data-theme="factorio-dark"] .lesson-card {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    border: none;
    border-radius: 0;
    box-shadow:
        inset 1px 1px 0 #2a2a2d,
        inset -1px -1px 0 #0f0f10,
        0 2px 4px rgba(0, 0, 0, 0.3);
}

[data-theme="factorio-dark"] .lesson-card:hover {
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10,
        0 0 0 1px var(--orange),
        0 4px 12px rgba(252, 163, 17, 0.15);
}

[data-theme="factorio-dark"] .lesson-number {
    color: var(--orange);
}

/* Visual/Quote boxes */
[data-theme="factorio-dark"] .visual-box {
    background: linear-gradient(180deg, #161618 0%, #131314 100%);
    border: none;
    border-radius: 0;
    box-shadow:
        inset 1px 1px 0 #0f0f10,
        inset -1px -1px 0 #2a2a2d;
}

[data-theme="factorio-dark"] .quote-box {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    border: none;
    border-left: 4px solid var(--factorio-iron);
    border-radius: 0;
    box-shadow:
        inset -1px 1px 0 #2a2a2d,
        inset 0 -1px 0 #0f0f10;
}

/* Comparison blocks */
[data-theme="factorio-dark"] .comparison-block {
    background: linear-gradient(180deg, #161618 0%, #131314 100%);
    border: none;
    border-radius: 0;
    box-shadow:
        inset 1px 1px 0 #0f0f10,
        inset -1px -1px 0 #2a2a2d;
    overflow: hidden;
}

[data-theme="factorio-dark"] .comparison-label {
    background: linear-gradient(180deg, #232326 0%, #1e1e20 100%);
    border-bottom: 1px solid #0f0f10;
    font-family: 'Titillium Web', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.7rem;
}

[data-theme="factorio-dark"] .comparison-label.good {
    color: #63c74d;
    border-left: 3px solid #63c74d;
}

[data-theme="factorio-dark"] .comparison-label.bad {
    color: var(--red);
    border-left: 3px solid var(--red);
}

/* Details/Summary */
[data-theme="factorio-dark"] details summary {
    color: var(--orange);
    font-family: 'Titillium Web', sans-serif;
    font-weight: 600;
}

[data-theme="factorio-dark"] details summary:hover {
    color: var(--factorio-yellow);
}

/* Dashboard panel overrides */
[data-theme="factorio-dark"] button.session-start-btn {
    background: linear-gradient(180deg, #ffd54f 0%, #fca311 50%, #d48806 100%);
    color: #131314;
    border: none;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2);
}
[data-theme="factorio-dark"] button.session-start-btn:hover {
    background: linear-gradient(180deg, #ffe082 0%, #ffd54f 50%, #fca311 100%);
    color: #131314;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.5),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 12px rgba(252, 163, 17, 0.4);
}
[data-theme="factorio-dark"] a.resume-btn {
    background: linear-gradient(180deg, #66bb6a 0%, #43a047 50%, #2e7d32 100%);
    color: #fff;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.3),
        inset -1px -1px 0 rgba(0,0,0,0.2);
}
[data-theme="factorio-dark"] a.resume-btn:hover {
    background: linear-gradient(180deg, #81c784 0%, #66bb6a 50%, #43a047 100%);
    color: #fff;
    box-shadow:
        inset 1px 1px 0 rgba(255,255,255,0.4),
        inset -1px -1px 0 rgba(0,0,0,0.2),
        0 0 12px rgba(67, 160, 71, 0.4);
}

/* Sidebar toggle - match industrial square aesthetic */
[data-theme="factorio-dark"] .sidebar-toggle {
    border-radius: 0;
    background: linear-gradient(180deg, #2d2d30 0%, #232326 100%);
    border: none;
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10;
}
[data-theme="factorio-dark"] .sidebar-toggle:hover {
    box-shadow:
        inset 1px 1px 0 #4a4a4d,
        inset -1px -1px 0 #1a1a1c,
        0 0 0 1px var(--orange);
    color: var(--orange);
}
[data-theme="factorio-dark"] body.sidebar-open .sidebar-toggle {
    background: transparent;
    box-shadow: none;
    border: none;
    border-right: 1px solid #0f0f10;
}
[data-theme="factorio-dark"] body.sidebar-open .sidebar-toggle:hover {
    background: linear-gradient(180deg, rgba(252, 163, 17, 0.1) 0%, transparent 100%);
    box-shadow: none;
}

/* --- Landing page --- */
[data-theme="factorio-dark"] .landing .hero-brand {
    color: var(--orange);
    font-family: 'Share Tech Mono', monospace;
    letter-spacing: 0.25em;
}
[data-theme="factorio-dark"] .landing .hero h1 {
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    letter-spacing: 0.04em;
}
[data-theme="factorio-dark"] .landing .hero h1 .accent {
    color: var(--factorio-yellow);
    text-shadow: 0 0 20px rgba(255, 213, 79, 0.3);
}
/* Conveyor belt divider under hero */
[data-theme="factorio-dark"] .landing .hero {
    padding-bottom: 3rem;
    position: relative;
}
/* Belt track */
[data-theme="factorio-dark"] .landing .hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -2rem;
    right: -2rem;
    height: 14px;
    background:
        linear-gradient(180deg, #28282b 0%, #1e1e20 100%);
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10,
        0 2px 6px rgba(0, 0, 0, 0.4);
}
/* Belt lines + items */
[data-theme="factorio-dark"] .landing .hero::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: -2rem;
    right: -2rem;
    height: 14px;
    z-index: 1;
    background:
        repeating-linear-gradient(
            90deg,
            transparent 0px,
            transparent 10px,
            rgba(0, 0, 0, 0.15) 10px,
            rgba(0, 0, 0, 0.15) 12px
        );
    animation: factorio-belt 0.25s linear infinite;
    pointer-events: none;
}

[data-theme="factorio-dark"] .landing .features {
    border: none;
    border-radius: 0;
    background: #0f0f10;
    box-shadow:
        inset 1px 1px 0 #2a2a2d,
        inset -1px -1px 0 #0a0a0b,
        0 4px 12px rgba(0, 0, 0, 0.5);
    gap: 2px;
}
[data-theme="factorio-dark"] .landing .feature {
    background: linear-gradient(180deg, #1e1e20 0%, #1a1a1c 100%);
    border-radius: 0;
}
[data-theme="factorio-dark"] .landing .feature-icon {
    color: var(--factorio-yellow);
    font-family: 'Share Tech Mono', monospace;
    text-shadow: 0 0 6px rgba(255, 213, 79, 0.3);
}
[data-theme="factorio-dark"] .landing .feature-title {
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.9rem;
}
[data-theme="factorio-dark"] .landing .section-label {
    color: var(--orange);
    font-family: 'Share Tech Mono', monospace;
    letter-spacing: 0.15em;
}
[data-theme="factorio-dark"] .landing .course-card {
    border: none;
    border-radius: 0;
    background: linear-gradient(180deg, #242427 0%, #1e1e20 100%);
    box-shadow:
        inset 1px 1px 0 #3a3a3d,
        inset -1px -1px 0 #0f0f10,
        0 4px 8px rgba(0, 0, 0, 0.4);
    position: relative;
}
[data-theme="factorio-dark"] .landing .course-card::before {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    top: 10px;
    left: 10px;
    background: radial-gradient(circle at 30% 30%, #5a5a5d 0%, #2a2a2d 60%, #1a1a1d 100%);
    border-radius: 50%;
    box-shadow: inset 0 1px 1px rgba(255,255,255,0.15);
}
[data-theme="factorio-dark"] .landing .course-card::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    top: 10px;
    right: 10px;
    background: radial-gradient(circle at 30% 30%, #5a5a5d 0%, #2a2a2d 60%, #1a1a1d 100%);
    border-radius: 50%;
    box-shadow: inset 0 1px 1px rgba(255,255,255,0.15);
}
[data-theme="factorio-dark"] .landing .course-card:hover {
    transform: translateY(-2px);
    box-shadow:
        inset 1px 1px 0 #4a4a4d,
        inset -1px -1px 0 #0f0f10,
        0 0 0 1px var(--orange),
        0 0 20px rgba(252, 163, 17, 0.15),
        0 6px 12px rgba(0, 0, 0, 0.5);
}
[data-theme="factorio-dark"] .landing .course-card .course-name {
    font-family: 'Titillium Web', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
[data-theme="factorio-dark"] .landing .course-card .course-status {
    color: var(--orange);
}
[data-theme="factorio-dark"] .landing .course-card .course-meta {
    color: var(--factorio-yellow);
    opacity: 0.7;
}
[data-theme="factorio-dark"] .landing .landing-footer .vibe-tag {
    color: var(--factorio-yellow);
    opacity: 0.6;
    font-family: 'Share Tech Mono', monospace;
}

/* Disable pulse animation for cleaner industrial look */
[data-theme="factorio-dark"] .session-timer:not([hidden]),
[data-theme="factorio-dark"] .floating-session-timer {
    animation: none;
}