:root {

    --bg: #f0f4ff;
    --bg2: #e2e8f9;
    --surface: rgba(255, 255, 255, 0.55);
    --surface-hover: rgba(255, 255, 255, 0.75);
    --border: rgba(180, 190, 220, 0.45);
    --text: #111827;
    --text-muted: #4b5563;
    --text-faint: #9ca3af;
    --shadow: rgba(60, 70, 120, 0.12);
    --shadow-deep: rgba(60, 70, 120, 0.22);

    --accent: #4361ee;
    --accent-rgb: 67, 97, 238;
    --accent-glow: rgba(67, 97, 238, 0.35);
    --accent-subtle: rgba(67, 97, 238, 0.12);

    --temp-color: #ef4444;
    --temp-glow: rgba(239, 68, 68, 0.4);
    --pop-color: #10b981;
    --pop-glow: rgba(16, 185, 129, 0.4);
    --tech-color: #8b5cf6;
    --tech-glow: rgba(139, 92, 246, 0.4);

    --track-bg: rgba(0, 0, 0, 0.08);

    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-pill: 999px;

    --fast: 0.18s;
    --normal: 0.35s;
    --slow: 0.65s;

    --font-display: 'Outfit', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
}

[data-theme="dark"] {
    --bg: #080b14;
    --bg2: #0d1120;
    --surface: rgba(16, 22, 40, 0.7);
    --surface-hover: rgba(22, 30, 55, 0.85);
    --border: rgba(255, 255, 255, 0.09);
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-faint: #475569;
    --shadow: rgba(0, 0, 0, 0.5);
    --shadow-deep: rgba(0, 0, 0, 0.75);
    --track-bg: rgba(255, 255, 255, 0.07);
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
    min-height: 100vh;
    transition: background var(--slow) ease, color var(--normal) ease;
}

img {
    max-width: 100%;
    display: block;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    outline: none;
    background: none;
}

select {
    font-family: inherit;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

#bg-overlay {
    position: fixed;
    inset: 0;
    z-index: -4;
    background: var(--bg);
    transition: background var(--slow) ease;
}

#bg-image {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -3;
    opacity: 0;
    transform: scale(1.08);
    transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
}

#bg-image.bg-visible {
    opacity: 0.38;
    transform: scale(1);
}

[data-theme="light"] #bg-image.bg-visible {
    opacity: 0.18;
}

#particle-canvas {
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
}

#time-travel-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: #000;
    opacity: 1;
    transition: opacity 0.9s ease;
}

#time-travel-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
}

#time-vortex-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

#time-travel-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #fff;
    padding: 2rem;
}

.warp-logo {
    font-size: 4rem;
    animation: warpPulse 1.5s ease-in-out infinite;
    margin-bottom: 1rem;
}

#time-travel-text {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 4vw, 2rem);
    font-weight: 600;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
    letter-spacing: 0.04em;
    text-shadow: 0 0 30px rgba(99, 179, 237, 0.8);
}

#time-travel-text.visible {
    opacity: 1;
    transform: translateY(0);
}

.warp-bar {
    width: 280px;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    margin: 1.5rem auto 0;
    overflow: hidden;
    opacity: 0;
    transition: opacity 0.5s ease 1.5s;
}

.warp-bar.visible {
    opacity: 1;
}

.warp-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #4361ee, #56cfe1);
    border-radius: 2px;
    transition: width 3.5s cubic-bezier(0.4, 0, 0.2, 1) 1.8s;
    box-shadow: 0 0 12px rgba(86, 207, 225, 0.6);
}

.warp-bar-fill.running {
    width: 100%;
}

@keyframes warpPulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.15);
        filter: drop-shadow(0 0 20px rgba(86, 207, 225, 0.8));
    }
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

#hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 2rem 1rem;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(var(--accent-rgb), 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--accent-rgb), 0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    max-width: 680px;
    width: 100%;
    animation: heroReveal 0.9s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes heroReveal {
    from {
        opacity: 0;
        transform: translateY(32px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 0.35rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    backdrop-filter: blur(12px);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    animation: badgePing 2s ease-in-out infinite;
    box-shadow: 0 0 8px var(--accent-glow);
}

@keyframes badgePing {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.4);
    }
}

.hero-title {
    font-family: var(--font-display);
    line-height: 1.05;
    font-weight: 900;
}

.title-line-1 {
    display: block;
    font-size: clamp(2.6rem, 7vw, 5rem);
    color: var(--text);
    letter-spacing: -0.02em;
}

.title-line-2 {
    display: block;
    font-size: clamp(3.2rem, 10vw, 7.5rem);
    letter-spacing: -0.03em;
}

.gradient-text {
    background: linear-gradient(120deg, var(--accent) 0%, #56cfe1 50%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradientShift 5s ease infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% center;
    }

    50% {
        background-position: 100% center;
    }

    100% {
        background-position: 0% center;
    }
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-muted);
    max-width: 520px;
    line-height: 1.7;
}

.hero-globe-wrap {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0.5rem auto;
}

#globe-canvas {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    box-shadow: 0 0 40px rgba(var(--accent-rgb), 0.4),
        0 0 80px rgba(var(--accent-rgb), 0.15);
}

.globe-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgba(var(--accent-rgb), 0.25);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: ringPulse 3s ease-in-out infinite;
}

.globe-ring-1 {
    width: 230px;
    height: 230px;
    animation-delay: 0s;
}

.globe-ring-2 {
    width: 265px;
    height: 265px;
    animation-delay: 0.6s;
    opacity: 0.6;
}

.globe-ring-3 {
    width: 300px;
    height: 300px;
    animation-delay: 1.2s;
    opacity: 0.3;
}

@keyframes ringPulse {

    0%,
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.4;
    }

    50% {
        transform: translate(-50%, -50%) scale(1.04);
        opacity: 0.8;
    }
}

.hero-ctas {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-era-chips {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.era-chip {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 0.3rem 0.85rem;
    font-size: 0.78rem;
    font-weight: 600;
    backdrop-filter: blur(8px);
    color: var(--text-muted);
    transition: all var(--fast) ease;
    animation: chipFloat 4s ease-in-out infinite;
}

.era-chip:nth-child(1) {
    animation-delay: 0s;
}

.era-chip:nth-child(2) {
    animation-delay: 0.4s;
}

.era-chip:nth-child(3) {
    animation-delay: 0.8s;
}

.era-chip:nth-child(4) {
    animation-delay: 1.2s;
}

.era-chip:nth-child(5) {
    animation-delay: 1.6s;
}

@keyframes chipFloat {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-4px);
    }
}

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-dot {
    width: 26px;
    height: 40px;
    border: 2px solid var(--border);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.scroll-dot::after {
    content: '';
    width: 4px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    animation: scrollBounce 1.8s ease infinite;
}

@keyframes scrollBounce {
    0% {
        transform: translateY(0);
        opacity: 1;
    }

    80% {
        transform: translateY(14px);
        opacity: 0;
    }

    100% {
        transform: translateY(0);
        opacity: 0;
    }
}

.cta-button {
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--accent);
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    padding: 0.85rem 2.2rem;
    border-radius: var(--radius-pill);
    box-shadow: 0 4px 20px var(--accent-glow);
    transition: transform var(--fast) ease,
        box-shadow var(--fast) ease,
        background var(--normal) ease;
    white-space: nowrap;
}

.cta-button:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 8px 28px var(--accent-glow);
}

.cta-button:active {
    transform: scale(0.97);
}

.btn-icon {
    font-size: 1.15rem;
}

.btn-shine {
    position: absolute;
    top: -50%;
    left: -60%;
    width: 40%;
    height: 200%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transform: skewX(-20deg);
    animation: btnShine 3s ease infinite 1.5s;
}

@keyframes btnShine {
    0% {
        left: -60%;
    }

    30% {
        left: 120%;
    }

    100% {
        left: 120%;
    }
}

.ripple {
    position: relative;
    overflow: hidden;
}

.ripple-wave {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    transform: scale(0);
    animation: rippleAnim 0.6s linear;
    pointer-events: none;
}

@keyframes rippleAnim {
    to {
        transform: scale(4.5);
        opacity: 0;
    }
}

.glass-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.9rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--fast) ease;
    height: 44px;
    padding: 0 1rem;
}

.glass-button:hover {
    background: var(--surface-hover);
    transform: scale(1.04);
}

.icon-btn {
    width: 44px;
    padding: 0;
    border-radius: 50%;
    font-size: 1.1rem;
}

.nav-arrow-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.55rem 1.2rem;
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    font-weight: 600;
    backdrop-filter: blur(8px);
    transition: all var(--fast) ease;
}

.nav-arrow-btn:hover:not(:disabled) {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: scale(1.04);
}

.nav-arrow-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

#explorer-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 0 1rem 4rem;
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
    animation: fadeIn var(--slow) ease both;
}

.explorer-header {
    position: sticky;
    top: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
    transition: background var(--normal) ease;
}

.explorer-title-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
}

.explorer-logo {
    font-size: 1.3rem;
}

.explorer-title-text {
    display: none;
}

@media (min-width: 480px) {
    .explorer-title-text {
        display: inline;
    }
}

.header-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.voice-status-dot {
    display: block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--text-faint);
    transition: background var(--fast) ease, box-shadow var(--fast) ease;
    margin-top: 2px;
}

.voice-active .voice-status-dot {
    background: #10b981;
    box-shadow: 0 0 6px #10b981;
    animation: voicePing 1.2s ease infinite;
}

@keyframes voicePing {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.5);
    }
}

#timeline {
    position: sticky;
    top: 61px;
    z-index: 150;
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 0.9rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 24px var(--shadow);
}

.timeline-track {
    position: absolute;
    top: 50%;
    left: 10%;
    right: 10%;
    height: 3px;
    background: var(--track-bg);
    transform: translateY(-50%);
    z-index: 1;
    border-radius: 2px;
}

.timeline-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 2px;
    box-shadow: 0 0 12px var(--accent-glow);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1),
        background 0.5s ease;
}

.stepper {
    display: flex;
    justify-content: space-between;
    position: relative;
    z-index: 2;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    flex: 1;
    padding: 0.2rem 0;
    transition: all var(--fast) ease;
    position: relative;
}

.step:hover .dot {
    transform: scale(1.2);
}

.step:hover .step-label {
    color: var(--accent);
}

.step-icon {
    font-size: 0;
    line-height: 1;
    transition: font-size var(--fast) ease;
}

@media (min-width: 480px) {
    .step-icon {
        font-size: 1rem;
    }
}

.dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--track-bg);
    border: 3px solid var(--bg);
    transition: all var(--normal) ease;
    box-shadow: 0 0 0 2px var(--border);
}

.step-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-faint);
    transition: color var(--normal) ease, transform var(--fast) ease;
    white-space: nowrap;
    letter-spacing: 0.03em;
}

.step.active .dot {
    background: var(--accent);
    transform: scale(1.45);
    box-shadow: 0 0 14px var(--accent-glow), 0 0 0 3px var(--bg);
}

.step.active .step-label {
    color: var(--accent);
    transform: translateY(-1px);
}

.step.visited .dot {
    background: var(--accent);
    opacity: 0.55;
}

.glass-panel {
    background: var(--surface);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: 0 8px 36px var(--shadow);
    margin-bottom: 1.5rem;
    transition: background var(--normal) ease,
        border-color var(--normal) ease,
        transform var(--fast) ease,
        box-shadow var(--fast) ease;
}

.section-heading {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
}

.section-heading-icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 0 6px var(--accent-glow));
}

.era-hero-strip {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    align-items: stretch;
}

@media (max-width: 768px) {
    .era-hero-strip {
        grid-template-columns: 1fr;
    }
}

.era-media-wrap {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16/9;
    max-height: 260px;
    background: var(--bg2);
    flex-shrink: 0;
}

.era-main-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.6s ease;
    will-change: transform;
    transform: scale(1.05);
}

.era-main-img.loaded {
    transform: scale(1);
}

.era-img-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.55) 0%, transparent 55%);
}

.era-year-badge {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(8px);
    color: #fff;
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(255, 255, 255, 0.15);
    letter-spacing: 0.04em;
}

.era-text-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.era-icon-big {
    font-size: 2.8rem;
    line-height: 1;
    filter: drop-shadow(0 0 12px var(--accent-glow));
    animation: iconFloat 4s ease-in-out infinite;
}

@keyframes iconFloat {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-6px) rotate(5deg);
    }
}

.era-main-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.era-desc-text {
    font-size: 0.97rem;
    color: var(--text-muted);
    line-height: 1.8;
    flex-grow: 1;
    min-height: 0;
    overflow-y: hidden;

    max-height: 180px;
    padding-right: 0.25rem;
}

.era-title-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.era-title-row .era-icon-big {
    flex-shrink: 0;
}

.key-facts-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.key-fact-chip {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--accent-subtle);
    border: 1px solid rgba(var(--accent-rgb), 0.2);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.65rem;
    font-size: 0.78rem;
}

.key-fact-icon {
    font-size: 1rem;
}

.key-fact-label {
    color: var(--text-faint);
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    display: block;
}

.key-fact-value {
    color: var(--text);
    font-weight: 700;
    font-size: 0.85rem;
    display: block;
}

.era-inner-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--border);
    gap: 0.75rem;
    flex-wrap: wrap;
}

.era-inner-label {
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-faint);
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.era-inner-btns {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.voice-speak-btn {
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: var(--accent);
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.82rem;
    padding: 0.5rem 1.15rem;
    border-radius: var(--radius-pill);
    border: none;
    cursor: pointer;
    transition: all var(--fast) ease;
    box-shadow: 0 0 18px var(--accent-glow), 0 4px 12px rgba(0, 0, 0, 0.25);
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.voice-speak-btn:hover {
    transform: translateY(-2px) scale(1.04);
    box-shadow: 0 0 28px var(--accent-glow), 0 6px 18px rgba(0, 0, 0, 0.3);
}

.voice-speak-btn:active {
    transform: scale(0.96);
}

.voice-speak-btn.speaking {
    background: #10b981;
    box-shadow: 0 0 22px rgba(16, 185, 129, 0.65), 0 4px 12px rgba(0, 0, 0, 0.25);
    animation: speakGlow 1.4s ease-in-out infinite;
}

@keyframes speakGlow {

    0%,
    100% {
        box-shadow: 0 0 14px rgba(16, 185, 129, 0.5), 0 4px 12px rgba(0, 0, 0, 0.2);
    }

    50% {
        box-shadow: 0 0 32px rgba(16, 185, 129, 0.9), 0 6px 18px rgba(0, 0, 0, 0.3);
    }
}

.speak-pulse {
    position: absolute;
    inset: -3px;
    border-radius: var(--radius-pill);
    border: 2px solid transparent;
    pointer-events: none;
}

.voice-speak-btn.speaking .speak-pulse {
    border-color: rgba(16, 185, 129, 0.6);
    animation: speakRing 1.4s ease-in-out infinite;
}

@keyframes speakRing {
    0% {
        transform: scale(1);
        opacity: 0.9;
    }

    100% {
        transform: scale(1.28);
        opacity: 0;
    }
}

.voice-speak-btn:not(.speaking) .speak-pulse {
    border-color: rgba(var(--accent-rgb), 0.4);
    animation: speakRingIdle 2.4s ease-in-out infinite;
}

@keyframes speakRingIdle {
    0% {
        transform: scale(1);
        opacity: 0.7;
    }

    100% {
        transform: scale(1.22);
        opacity: 0;
    }
}

.theme-inner-btn.glass-button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    height: auto;
    font-size: 0.82rem;
    font-weight: 600;
    font-family: var(--font-display);
}

.theme-btn-text {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.decision-panel {
    border-left: 3px solid var(--accent);
    background: linear-gradient(135deg, var(--surface) 0%, var(--accent-subtle) 100%);
    animation: decisionAppear 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes decisionAppear {
    from {
        opacity: 0;
        transform: scale(0.97) translateY(8px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.decision-inner {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.decision-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--accent);
}

.decision-body {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.decision-choices {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.decision-choice-btn {
    flex: 1;
    min-width: 200px;
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: left;
    cursor: pointer;
    transition: all var(--fast) ease;
    font-family: var(--font-body);
}

.decision-choice-btn:hover {
    border-color: var(--accent);
    background: var(--accent-subtle);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.decision-choice-btn strong {
    display: block;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.3rem;
    font-size: 0.92rem;
}

.decision-choice-btn small {
    color: var(--text-faint);
    font-size: 0.78rem;
    line-height: 1.5;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 540px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.stat-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    transition: transform var(--fast) ease, box-shadow var(--fast) ease;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px var(--shadow-deep);
}

.stat-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stat-icon {
    font-size: 1.4rem;
    line-height: 1;
}

.stat-label {
    flex-grow: 1;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text);
    text-align: right;
}

.progress-track {
    height: 8px;
    background: var(--track-bg);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 4px;
    transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 8px;
    height: 100%;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 0 4px 4px 0;
}

.temp-fill {
    background: var(--temp-color);
    box-shadow: 0 0 10px var(--temp-glow);
}

.tech-fill {
    background: var(--tech-color);
    box-shadow: 0 0 10px var(--tech-glow);
}

.circular-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.25rem 0;
}

.circular-svg {
    width: 70px;
    height: 70px;
    transform: rotate(-90deg);
    overflow: visible;
}

.circ-track {
    fill: none;
    stroke: var(--track-bg);
    stroke-width: 8;
}

.circ-fill {
    fill: none;
    stroke: var(--pop-color);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 201;
    stroke-dashoffset: 201;
    filter: drop-shadow(0 0 6px var(--pop-glow));
    transition: stroke-dashoffset 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.pop-fill {
    stroke: var(--pop-color);
}

.milestones-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.85rem;
}

.milestone-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    transition: all var(--fast) ease;
    animation: cardPop 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
    cursor: default;
}

.milestone-card:hover {
    transform: translateY(-4px) scale(1.02);
    border-color: var(--accent);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.milestone-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.milestone-year {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.milestone-title {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text);
    line-height: 1.3;
}

.milestone-desc {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.6;
}

@keyframes cardPop {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(10px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.advanced-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 900px) {
    .advanced-row {
        grid-template-columns: 1fr 1fr;
    }
}

.compare-selectors {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.select-wrap {
    flex: 1;
    min-width: 120px;
}

select {
    width: 100%;
    padding: 0.55rem 0.9rem;
    border-radius: var(--radius-sm);
    background: var(--bg2);
    color: var(--text);
    border: 1px solid var(--border);
    font-family: var(--font-body);
    font-size: 0.88rem;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
    transition: border-color var(--fast) ease;
}

select:focus {
    border-color: var(--accent);
}

.vs-badge {
    background: var(--accent);
    color: #fff;
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 0.78rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 0 12px var(--accent-glow);
}

.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.compare-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 0.85rem;
    transition: border-color var(--normal) ease;
}

.compare-card:hover {
    border-color: var(--accent);
}

.compare-card h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    color: var(--accent);
}

.compare-stat-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.4rem;
    font-size: 0.8rem;
}

.compare-stat-row .c-label {
    color: var(--text-muted);
}

.compare-stat-row .c-value {
    font-weight: 700;
    color: var(--text);
}

.compare-bar-mini {
    height: 4px;
    background: var(--track-bg);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 0.6rem;
}

.compare-bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.sim-desc {
    font-size: 0.87rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.slider-group {
    margin-bottom: 1rem;
}

.slider-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.slider-label-row label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
}

.slider-val {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--track-bg);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: transform var(--fast) ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    cursor: pointer;
}

.sim-result-card {
    margin-top: 1rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    animation: simResultAppear 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes simResultAppear {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.97);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.sim-result-inner {
    padding: 1.1rem;
    border-left: 4px solid var(--accent);
    background: var(--accent-subtle);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.sim-result-inner h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.4rem;
}

.sim-result-inner p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.chart-legend {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
    flex-wrap: wrap;
}

.legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.temp-fill {
    background: var(--temp-color);
}

.legend-dot.pop-fill {
    background: var(--pop-color);
}

.legend-dot.tech-fill {
    background: var(--tech-color);
}

.chart-container {
    display: flex;
    align-items: flex-end;
    gap: 0.6rem;
    height: 160px;
    padding: 0 0.5rem;
}

.chart-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    height: 100%;
    justify-content: flex-end;
    transition: all var(--fast) ease;
}

.chart-col.active-col .chart-bar {
    opacity: 1;
}

.chart-col:not(.active-col) .chart-bar {
    opacity: 0.45;
}

.chart-bars-group {
    display: flex;
    gap: 3px;
    align-items: flex-end;
    height: 100%;
}

.chart-bar {
    width: 10px;
    border-radius: 3px 3px 0 0;
    min-height: 4px;
    transition: height 1s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (max-width: 480px) {
    .chart-bar {
        width: 7px;
    }
}

.bar-temp {
    background: var(--temp-color);
    box-shadow: 0 0 6px var(--temp-glow);
}

.bar-pop {
    background: var(--pop-color);
    box-shadow: 0 0 6px var(--pop-glow);
}

.bar-tech {
    background: var(--tech-color);
    box-shadow: 0 0 6px var(--tech-glow);
}

.chart-label {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-faint);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.era-nav-arrows {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 0.5rem 0 2rem;
}

.era-counter {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.achievement-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 9000;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    pointer-events: none;
}

.achievement-toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.75rem 1.1rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 8px 30px var(--shadow-deep);
    animation: toastIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) both,
        toastOut 0.4s ease 3.6s both;
    min-width: 220px;
    pointer-events: auto;
}

.toast-emoji {
    font-size: 1.5rem;
}

.toast-label {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    display: block;
    margin-bottom: 0.1rem;
}

.toast-title {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text);
    display: block;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(60px) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(60px);
    }
}

.impact-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    text-align: center;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: 0 20px 60px var(--shadow-deep);
    z-index: 8000;
    max-width: 360px;
    width: 90%;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.impact-toast.visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.impact-toast h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.impact-toast p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.92);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.anim-slide-up {
    animation: slideUp 0.55s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.anim-scale-in {
    animation: scaleIn 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.anim-fade-in {
    animation: fadeIn 0.5s ease both;
}

.era-transition-flash {
    position: fixed;
    inset: 0;
    z-index: 500;
    pointer-events: none;
    opacity: 0;
    background: radial-gradient(ellipse, var(--accent) 0%, transparent 70%);
    transition: opacity 0.15s ease;
}

.era-transition-flash.flash {
    opacity: 0.18;
}

@media (max-width: 480px) {
    .glass-panel {
        padding: 1.25rem;
        border-radius: var(--radius-md);
    }

    .milestones-grid {
        grid-template-columns: 1fr 1fr;
    }

    .key-facts-row {
        grid-template-columns: 1fr 1fr;
    }

    .compare-grid {
        grid-template-columns: 1fr;
    }

    .era-nav-arrows {
        gap: 0.75rem;
    }
}

@media (min-width: 768px) {
    .milestones-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (min-width: 1024px) {
    #explorer-container {
        padding: 0 2rem 4rem;
    }

    .glass-panel {
        padding: 2rem;
    }
}

@media (min-width: 1440px) {
    .era-desc-text {
        font-size: 1.03rem;
    }

    .chart-container {
        height: 200px;
    }
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

::selection {
    background: rgba(var(--accent-rgb), 0.3);
    color: var(--text);
}