/* undo.systems - Y2K Futurism Aesthetic */
/* Fonts: Space Grotesk (display), DM Sans (body), IBM Plex Mono (accent) */
/* Palette: Earth Tones + Aurora */

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background: #1a1712;
    color: #e8dfd4;
    font-family: 'DM Sans', sans-serif;
    font-size: 1.05rem;
    line-height: 1.75;
    overflow-x: hidden;
}

/* ============================================
   EPOCH INDICATOR (floating pill nav)
   ============================================ */
.epoch-indicator {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.epoch-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(232, 223, 212, 0.2);
    transition: background 0.4s ease, transform 0.3s ease, box-shadow 0.4s ease;
    cursor: pointer;
}

.epoch-dot.active {
    background: #4ecdc4;
    transform: scale(1.4);
    box-shadow: 0 0 12px rgba(78, 205, 196, 0.5);
}

/* ============================================
   FLOATING PARTICLES
   ============================================ */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    will-change: transform, opacity;
}

@keyframes drift1 {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 0; }
    10% { opacity: 0.6; }
    90% { opacity: 0.6; }
    100% { transform: translate(calc(100vw * var(--dx)), calc(100vh * var(--dy))) rotate(360deg); opacity: 0; }
}

@keyframes drift2 {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 0; }
    15% { opacity: 0.4; }
    85% { opacity: 0.4; }
    100% { transform: translate(calc(-80vw * var(--dx)), calc(60vh * var(--dy))) rotate(-180deg); opacity: 0; }
}

/* ============================================
   SECTIONS / EPOCHS
   ============================================ */
.epoch {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: grid;
    grid-template-rows: 1fr;
    contain: layout;
    overflow: hidden;
}

.epoch-content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
}

/* ============================================
   AURORA LAYERS
   ============================================ */
.aurora-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 60%;
    pointer-events: none;
    mix-blend-mode: screen;
    mask-image: linear-gradient(to bottom, black 40%, transparent);
    -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent);
    will-change: background-position;
}

.aurora-layer-1 {
    background: linear-gradient(135deg, #4ecdc4 0%, #7c5cbf 35%, #e06377 65%, #f7b733 100%);
    background-size: 400% 400%;
    animation: auroraShift1 8s ease-in-out infinite;
    opacity: 0.6;
}

.aurora-layer-2 {
    background: linear-gradient(225deg, #f7b733 0%, #e06377 30%, #7c5cbf 60%, #4ecdc4 100%);
    background-size: 400% 400%;
    animation: auroraShift2 12s ease-in-out infinite;
    opacity: 0.4;
}

.aurora-layer-3 {
    background: linear-gradient(45deg, #7c5cbf 0%, #4ecdc4 40%, #f7b733 70%, #e06377 100%);
    background-size: 400% 400%;
    animation: auroraShift3 18s ease-in-out infinite;
    opacity: 0.3;
}

.aurora-reverse .aurora-layer-1,
.aurora-layer-1.aurora-reverse {
    animation: auroraShift1 8s ease-in-out infinite reverse;
}

.aurora-reverse .aurora-layer-2,
.aurora-layer-2.aurora-reverse {
    animation: auroraShift2 12s ease-in-out infinite reverse;
}

.aurora-reverse .aurora-layer-3,
.aurora-layer-3.aurora-reverse {
    animation: auroraShift3 18s ease-in-out infinite reverse;
}

@keyframes auroraShift1 {
    0% { background-position: 0% 0%; }
    25% { background-position: 100% 50%; }
    50% { background-position: 50% 100%; }
    75% { background-position: 0% 50%; }
    100% { background-position: 0% 0%; }
}

@keyframes auroraShift2 {
    0% { background-position: 100% 100%; }
    33% { background-position: 0% 50%; }
    66% { background-position: 50% 0%; }
    100% { background-position: 100% 100%; }
}

@keyframes auroraShift3 {
    0% { background-position: 50% 0%; }
    50% { background-position: 0% 100%; }
    100% { background-position: 50% 0%; }
}

/* ============================================
   TYPOGRAPHY - KINETIC ANIMATED
   ============================================ */
.kinetic-title {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    letter-spacing: -0.02em;
    color: #e8dfd4;
    text-align: center;
}

.kinetic-title .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    animation: letterFloat 0.6s forwards;
    will-change: transform, opacity;
}

.epoch.visible .kinetic-title .letter {
    animation: letterFloat 0.6s forwards;
}

@keyframes letterFloat {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    60% {
        opacity: 1;
        transform: translateY(-5px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3rem);
    letter-spacing: -0.02em;
    color: #e8dfd4;
    margin-bottom: 1.5rem;
    display: inline-block;
}

.body-text {
    font-family: 'DM Sans', sans-serif;
    font-weight: 400;
    font-size: 1.05rem;
    line-height: 1.75;
    color: #e8dfd4;
    max-width: 580px;
}

/* ============================================
   EPOCH MARKER (watermark labels)
   ============================================ */
.epoch-marker {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: #9c8e7c;
    opacity: 0.5;
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
}

/* ============================================
   UNDERLINE-DRAW PATTERN
   ============================================ */
.underline-draw {
    background-image: linear-gradient(#6fe7c7, #6fe7c7);
    background-position: 0 100%;
    background-size: 0% 3px;
    background-repeat: no-repeat;
    transition: background-size 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    padding-bottom: 4px;
}

.underline-draw:hover,
.underline-draw.visible {
    background-size: 100% 3px;
}

.card-title.underline-draw {
    background-size: 0% 2px;
}

.card-title.underline-draw:hover,
.card-title.underline-draw.visible {
    background-size: 100% 2px;
}

/* ============================================
   SECTION 1: THE MOMENT
   ============================================ */
.epoch-moment {
    background: #1a1712;
}

.epoch-moment .epoch-content {
    min-height: 100vh;
}

#heroTitle {
    font-size: clamp(4rem, 12vw, 10rem);
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
}

.tagline {
    font-family: 'DM Sans', sans-serif;
    font-size: clamp(1rem, 2vw, 1.4rem);
    color: #9c8e7c;
    opacity: 0;
    transition: opacity 1.2s ease 0.8s;
    text-align: center;
}

.epoch-moment.visible .tagline {
    opacity: 1;
}

/* ============================================
   SECTION 2: THE REVERSAL
   ============================================ */
.epoch-reversal {
    background: #2a2520;
}

.reversal-layout {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: flex-start;
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
    min-height: 100vh;
}

.glass-panel {
    background: rgba(62, 54, 44, 0.35);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(232, 223, 212, 0.06);
    border-radius: 16px;
    padding: 3rem 2.5rem;
    max-width: 460px;
    position: relative;
    transition: transform 0.6s ease, opacity 0.6s ease;
}

.panel-left {
    transform: translateY(40px);
    opacity: 0;
    z-index: 1;
    flex: 1 1 400px;
}

.panel-right {
    transform: translateY(80px);
    opacity: 0;
    z-index: 2;
    flex: 1 1 400px;
    margin-top: 40px;
}

.epoch-reversal.visible .panel-left {
    transform: translateY(0);
    opacity: 1;
}

.epoch-reversal.visible .panel-right {
    transform: translateY(40px);
    opacity: 1;
}

.panel-icon {
    margin-bottom: 1.5rem;
}

.glass-panel .body-text {
    color: #9c8e7c;
}

/* ============================================
   SECTION 3: THE ARCHIVE
   ============================================ */
.epoch-archive {
    background: #1a1712;
}

.archive-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    min-height: 100vh;
    align-content: center;
    position: relative;
}

.archive-card {
    background: rgba(62, 54, 44, 0.35);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(232, 223, 212, 0.06);
    border-radius: 12px;
    padding: 2rem;
    max-width: 420px;
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s ease;
    will-change: transform, opacity;
}

.archive-card.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.archive-card:hover {
    box-shadow: 0 8px 32px rgba(78, 205, 196, 0.1);
}

.card-1 { transition-delay: 0s; }
.card-2 { transition-delay: 0.1s; }
.card-3 { transition-delay: 0.2s; }
.card-4 { transition-delay: 0.3s; }
.card-5 { transition-delay: 0.4s; }
.card-6 { transition-delay: 0.5s; }

.card-icon {
    margin-bottom: 1rem;
}

.card-title {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.01em;
    color: #e8dfd4;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.card-text {
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    color: #9c8e7c;
    line-height: 1.6;
}

/* ============================================
   SECTION 4: THE MECHANISM
   ============================================ */
.epoch-mechanism {
    background: #2a2520;
}

.mechanism-layout {
    max-width: 680px;
    margin: 0 auto;
    min-height: 100vh;
}

.mechanism-prose {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mechanism-prose .section-title {
    margin-bottom: 0.5rem;
}

.inline-icon-break {
    display: flex;
    justify-content: center;
    padding: 1rem 0;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.inline-icon-break.visible {
    opacity: 1;
    transform: scale(1);
}

/* ============================================
   SECTION 5: THE RETURN
   ============================================ */
.epoch-return {
    background: #1a1712;
}

.return-layout {
    min-height: 100vh;
    text-align: center;
}

.rewind-text {
    font-family: 'DM Sans', sans-serif;
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: #9c8e7c;
    margin-bottom: 2rem;
    overflow: hidden;
    white-space: nowrap;
    width: 0;
    transition: width 1.5s ease;
}

.epoch-return.visible .rewind-text {
    width: 100%;
    max-width: 600px;
}

.return-title {
    font-size: clamp(3rem, 8vw, 7rem);
    margin-bottom: 1.5rem;
}

.begin-again {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: #4ecdc4;
    opacity: 0;
    transition: opacity 1s ease 1.2s;
}

.epoch-return.visible .begin-again {
    opacity: 1;
}

/* ============================================
   ICON ANIMATIONS
   ============================================ */
.icon-rewind {
    transition: transform 0.8s ease;
}

.visible .icon-rewind,
.epoch.visible .icon-rewind {
    animation: rewindSpin 1.2s ease-out forwards;
}

@keyframes rewindSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(-360deg); }
}

.icon-clock {
    transition: transform 0.8s ease;
}

.visible .icon-clock,
.epoch.visible .icon-clock {
    animation: clockSpin 6s linear infinite;
}

@keyframes clockSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(-360deg); }
}

.icon-spiral {
    transition: transform 0.8s ease;
}

.visible .icon-spiral,
.epoch.visible .icon-spiral {
    animation: spiralUnfurl 2s ease-out forwards;
}

@keyframes spiralUnfurl {
    0% { transform: rotate(-180deg) scale(0.5); opacity: 0; }
    100% { transform: rotate(0deg) scale(1); opacity: 1; }
}

/* ============================================
   WATERMARK TEXT
   ============================================ */
.watermark-text {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    color: #9c8e7c;
    opacity: 0.08;
    white-space: nowrap;
    overflow: hidden;
    pointer-events: none;
    z-index: 5;
    padding: 0.5rem 0;
    animation: watermarkScroll 30s linear infinite;
}

@keyframes watermarkScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .epoch-indicator {
        right: 12px;
    }

    .epoch-dot {
        width: 8px;
        height: 8px;
    }

    .reversal-layout {
        flex-direction: column;
        align-items: center;
    }

    .panel-right {
        margin-top: 0;
    }

    .epoch-reversal.visible .panel-right {
        transform: translateY(0);
    }

    .archive-layout {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

    .glass-panel {
        padding: 2rem 1.5rem;
    }

    .mechanism-layout {
        padding: 0 1rem;
    }

    .rewind-text {
        white-space: normal;
        width: auto;
    }
}

@media (max-width: 480px) {
    #heroTitle {
        font-size: clamp(3rem, 15vw, 5rem);
    }
    
    .return-title {
        font-size: clamp(2.5rem, 12vw, 4rem);
    }
}