/* undo.cafe - Light-Academia Retrofuturism */

:root {
    /* Color Palette */
    --color-aged-linen: #f4efe6;
    --color-parchment-deep: #e8dfd0;
    --color-ink-carbon: #1c1a17;
    --color-steel-annotation: #7a8890;
    --color-signal-orange: #e85d26;
    --color-circuit-teal: #1b9e8f;
    --color-neon-violet: #9055e0;
    --color-darkroom-slate: #2a2622;
    
    /* Typography Scale */
    --fs-hero: clamp(4rem, 12vw, 10rem);
    --fs-hero-secondary: clamp(1.6rem, 4.8vw, 4rem);
    --fs-heading: clamp(1.6rem, 3.5vw, 2.6rem);
    --fs-body: clamp(0.95rem, 1.8vw, 1.15rem);
    --fs-monospace: clamp(0.7rem, 1.2vw, 0.85rem);
    
    /* Line Heights */
    --lh-hero: 0.92;
    --lh-heading: 1.15;
    --lh-body: 1.65;
    
    /* Letter Spacing */
    --ls-body: 0.01em;
    --ls-nav: 0.12em;
    --ls-monospace: 0.06em;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Libre Franklin', sans-serif;
    background-color: var(--color-aged-linen);
    color: var(--color-ink-carbon);
    font-size: var(--fs-body);
    line-height: var(--lh-body);
    letter-spacing: var(--ls-body);
    position: relative;
}

/* Paper Grain Texture */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.7" numOctaves="4" seed="2" /><feColorMatrix type="saturate" values="0.3" /></filter><rect width="100" height="100" fill="%23f4efe6" filter="url(%23noise)" /></svg>');
    opacity: 0.025;
    pointer-events: none;
    z-index: -1;
}

/* === HERO SECTION === */

.hero-container {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-aged-linen);
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    text-align: center;
}

.hero-text-wrapper {
    position: relative;
    display: inline-block;
}

.hero-primary {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-style: italic;
    font-size: var(--fs-hero);
    line-height: var(--lh-hero);
    color: var(--color-ink-carbon);
    margin: 0;
    padding: 0;
    display: inline-block;
    opacity: 0;
    position: relative;
}

.hero-primary.typing {
    animation: typewriter-appear 700ms ease-out forwards;
}

.hero-primary.shake {
    animation: shake-error 400ms cubic-bezier(0.36, 0.07, 0.19, 0.97) forwards;
}

.hero-primary.color-transition {
    animation: orange-to-ink 800ms ease-out forwards;
}

@keyframes typewriter-appear {
    0% {
        opacity: 0;
        clip-path: polygon(0 0, 0% 0, 0% 100%, 0 100%);
    }
    100% {
        opacity: 1;
        clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }
}

@keyframes shake-error {
    0%, 100% {
        transform: translateX(0);
    }
    20% {
        transform: translateX(-4px);
    }
    40% {
        transform: translateX(4px);
    }
    60% {
        transform: translateX(-2px);
    }
    80% {
        transform: translateX(2px);
    }
}

@keyframes orange-to-ink {
    0% {
        color: var(--color-signal-orange);
    }
    100% {
        color: var(--color-ink-carbon);
    }
}

.hero-secondary {
    font-family: 'Libre Franklin', sans-serif;
    font-weight: 300;
    font-size: var(--fs-hero-secondary);
    color: var(--color-circuit-teal);
    margin-left: 0.5em;
    display: inline-block;
    opacity: 0;
    transform: translateY(10px);
    position: relative;
}

.hero-secondary.fade-in {
    animation: fade-up 600ms ease-out forwards;
    animation-delay: 1100ms;
}

@keyframes fade-up {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.cursor {
    display: inline-block;
    width: 3px;
    height: 0.8em;
    background-color: var(--color-signal-orange);
    margin-left: 0.1em;
    animation: blink 530ms infinite;
    opacity: 0;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.cursor.visible {
    opacity: 1;
}

@keyframes blink {
    0%, 50%, 100% {
        opacity: 1;
    }
    25%, 75% {
        opacity: 0;
    }
}

/* === PAGE LAYOUT GRID === */

.page-wrapper {
    display: grid;
    grid-template-columns: 80px repeat(10, 1fr) 80px;
    gap: 0;
    grid-auto-rows: auto;
    max-width: 100%;
    margin: 0 auto;
}

/* Left Spine Margin */
.left-spine {
    grid-column: 1;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 0.5rem;
    background-color: var(--color-aged-linen);
    border-right: 1px solid rgba(232, 93, 38, 0.1);
    z-index: 100;
    opacity: 0;
    transform: translateX(-80px);
    animation: slide-in-left 600ms ease-out forwards;
    animation-delay: 1500ms;
}

.spine-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: var(--fs-monospace);
    letter-spacing: var(--ls-monospace);
    color: var(--color-steel-annotation);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    margin-bottom: 2rem;
    font-weight: 400;
}

.progress-indicator {
    width: 2px;
    flex-grow: 1;
    background: linear-gradient(180deg, var(--color-signal-orange) 0%, var(--color-neon-violet) 50%, var(--color-circuit-teal) 100%);
    border-radius: 1px;
    margin: 2rem 0;
    transform: scaleY(0);
    transform-origin: top;
    animation: fill-progress 1.5s ease-out forwards;
    animation-delay: 2000ms;
}

@keyframes fill-progress {
    from {
        transform: scaleY(0);
    }
    to {
        transform: scaleY(1);
    }
}

.commit-markers {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.commit-dot {
    position: relative;
    cursor: pointer;
}

.commit-dot::before {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: var(--color-signal-orange);
    border-radius: 50%;
    top: 0;
    left: -3px;
    animation: pulse-attention 2s ease-in-out infinite;
}

@keyframes pulse-attention {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.15);
    }
}

.commit-dot:hover::before {
    width: 10px;
    height: 10px;
    left: -5px;
}

.commit-tooltip {
    position: absolute;
    left: -60px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--color-darkroom-slate);
    color: var(--color-aged-linen);
    padding: 0.4rem 0.6rem;
    border-radius: 2px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease;
    white-space: nowrap;
}

.commit-dot:hover .commit-tooltip {
    opacity: 1;
}

@keyframes slide-in-left {
    from {
        opacity: 0;
        transform: translateX(-80px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Content Area */
.content-area {
    grid-column: 2 / 12;
    padding: 0 3rem;
}

.right-margin {
    grid-column: 12;
    background-color: var(--color-aged-linen);
    border-left: 1px solid rgba(232, 93, 38, 0.1);
}

/* === NAVIGATION HEADER === */

.nav-header {
    position: relative;
    padding: 4rem 0 2rem 0;
    margin-bottom: 4rem;
    opacity: 0;
    animation: fade-in 800ms ease-out forwards;
    animation-delay: 1600ms;
}

.nav-domain {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1.5rem;
}

.nav-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: var(--fs-monospace);
    letter-spacing: var(--ls-nav);
    color: var(--color-ink-carbon);
    font-weight: 400;
    text-transform: uppercase;
}

.nav-label span {
    opacity: 0;
    animation: letter-pop 200ms ease-out forwards;
}

@keyframes letter-pop {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.horizontal-rule {
    height: 1px;
    background-color: var(--color-signal-orange);
    width: 0;
    margin: 1rem auto;
    animation: draw-line 1.2s ease-out forwards;
    animation-delay: 1700ms;
}

@keyframes draw-line {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

/* === CONTENT SECTIONS === */

.content-section {
    margin-bottom: 120px;
    position: relative;
    opacity: 0;
    animation: reveal-section 500ms ease-out forwards;
}

.section-heading {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-style: italic;
    font-size: var(--fs-heading);
    line-height: var(--lh-heading);
    color: var(--color-ink-carbon);
    margin-bottom: 2rem;
    grid-column: 1 / 8;
    transform: translateX(-30px);
    opacity: 0;
    animation: slide-in-reveal 500ms ease-out forwards;
}

.content-text {
    column-count: 1;
    grid-column: 1 / 6;
}

.content-text p {
    margin-bottom: 1.5rem;
    transform: translateY(15px);
    opacity: 0;
    animation: fade-up 600ms ease-out forwards;
}

.content-text p:nth-of-type(1) {
    animation-delay: 200ms;
}

.content-text p:nth-of-type(2) {
    animation-delay: 400ms;
}

.content-text p:nth-of-type(3) {
    animation-delay: 600ms;
}

@keyframes slide-in-reveal {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes reveal-section {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Text Decorations - Tracked Changes */
s {
    text-decoration: line-through;
    color: var(--color-neon-violet);
    opacity: 0.6;
    text-decoration-color: var(--color-neon-violet);
}

s + em {
    font-style: italic;
    color: var(--color-ink-carbon);
}

/* Watercolor Washes */
.watercolor-wash {
    position: absolute;
    width: 150%;
    height: 300px;
    top: 50%;
    left: -25%;
    transform: translateY(-50%);
    z-index: -1;
    opacity: 0;
    animation: bloom-wash 800ms ease-out forwards;
}

.wash-01 {
    background: radial-gradient(ellipse at 30% 40%, rgba(27, 158, 143, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 60%, rgba(232, 93, 38, 0.06) 0%, transparent 60%);
    animation-delay: 400ms;
}

.wash-02 {
    background: radial-gradient(ellipse at 40% 50%, rgba(232, 93, 38, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 60% 30%, rgba(27, 158, 143, 0.06) 0%, transparent 70%);
    animation-delay: 500ms;
}

.wash-03 {
    background: radial-gradient(ellipse at 35% 45%, rgba(144, 85, 224, 0.06) 0%, transparent 70%),
                radial-gradient(ellipse at 65% 55%, rgba(27, 158, 143, 0.05) 0%, transparent 60%);
    animation-delay: 600ms;
}

@keyframes bloom-wash {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Circuit Traces */
.circuit-trace {
    position: absolute;
    right: -5%;
    top: 50%;
    transform: translateY(-50%);
    width: 300px;
    height: 150px;
    opacity: 0.3;
    animation: draw-circuit 1.2s ease-out forwards;
}

.section-01 .circuit-trace {
    animation-delay: 600ms;
}

.section-02 .circuit-trace {
    animation-delay: 700ms;
}

.section-03 .circuit-trace {
    animation-delay: 800ms;
}

@keyframes draw-circuit {
    from {
        opacity: 0;
    }
    to {
        opacity: 0.3;
    }
}

.circuit-trace path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: dash-draw 1.2s ease-out forwards;
}

@keyframes dash-draw {
    from {
        stroke-dashoffset: 1000;
    }
    to {
        stroke-dashoffset: 0;
    }
}

/* === FOOTER === */

.footer-inverted {
    background-color: var(--color-darkroom-slate);
    color: var(--color-aged-linen);
    padding: 6rem 3rem;
    text-align: right;
    grid-column: 2 / 12;
    margin-top: 120px;
    position: relative;
    overflow: hidden;
}

.footer-domain-right {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-style: italic;
    font-size: var(--fs-heading);
    line-height: var(--lh-heading);
    margin-bottom: 3rem;
    display: flex;
    flex-direction: row-reverse;
    justify-content: flex-end;
    align-items: baseline;
    gap: 1rem;
}

.footer-domain-cafe {
    font-family: 'Libre Franklin', sans-serif;
    font-weight: 300;
    font-size: calc(var(--fs-heading) * 0.4);
}

.footer-domain-undo {
    color: var(--color-aged-linen);
}

.footer-nav-reversed {
    font-family: 'IBM Plex Mono', monospace;
    font-size: var(--fs-monospace);
    letter-spacing: var(--ls-nav);
    text-transform: uppercase;
}

.footer-nav-label span {
    display: inline-block;
    opacity: 0;
    animation: shake-word 300ms cubic-bezier(0.36, 0.07, 0.19, 0.97) forwards;
}

.footer-nav-label span:nth-child(1) {
    animation-delay: 2200ms;
}

.footer-nav-label span:nth-child(2) {
    animation-delay: 2350ms;
}

.footer-nav-label span:nth-child(3) {
    animation-delay: 2500ms;
}

.footer-nav-label span:nth-child(4) {
    animation-delay: 2650ms;
}

@keyframes shake-word {
    0%, 100% {
        opacity: 1;
        transform: translateX(0);
    }
    25% {
        opacity: 1;
        transform: translateX(-2px);
    }
    75% {
        opacity: 1;
        transform: translateX(2px);
    }
}

/* === INTERACTIVE STATES === */

a {
    color: var(--color-circuit-teal);
    text-decoration: underline;
    transition: color 200ms ease;
}

a:hover {
    color: var(--color-signal-orange);
    background: linear-gradient(90deg, var(--color-signal-orange), var(--color-neon-violet), var(--color-circuit-teal));
    background-clip: text;
    -webkit-background-clip: text;
}

a:visited {
    color: var(--color-neon-violet);
}

/* === RESPONSIVE DESIGN === */

@media (max-width: 1024px) {
    .page-wrapper {
        grid-template-columns: 60px repeat(10, 1fr) 60px;
    }
    
    .left-spine {
        width: 60px;
    }
    
    .content-area {
        padding: 0 2rem;
    }
}

@media (max-width: 768px) {
    .page-wrapper {
        grid-template-columns: 1fr;
    }
    
    .left-spine {
        position: relative;
        width: 100%;
        height: auto;
        flex-direction: row;
        padding: 1rem;
        border-right: none;
        border-bottom: 1px solid rgba(232, 93, 38, 0.1);
        gap: 2rem;
        justify-content: space-between;
    }
    
    .spine-label {
        writing-mode: horizontal-tb;
        transform: none;
        margin: 0;
    }
    
    .progress-indicator {
        width: 100px;
        height: 2px;
        flex-grow: 0;
    }
    
    .commit-markers {
        flex-direction: row;
        gap: 1rem;
    }
    
    .content-area {
        grid-column: 1;
        padding: 0 1.5rem;
    }
    
    .right-margin {
        display: none;
    }
    
    .section-heading {
        grid-column: 1;
    }
    
    .content-text {
        grid-column: 1;
    }
    
    .circuit-trace {
        display: none;
    }
    
    .footer-inverted {
        grid-column: 1;
        text-align: center;
    }
    
    .footer-domain-right {
        justify-content: center;
        flex-direction: row;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-aged-linen: #2a2622;
        --color-parchment-deep: #3a3430;
        --color-ink-carbon: #f4efe6;
        --color-steel-annotation: #a0a8b0;
    }
    
    body {
        background-color: var(--color-aged-linen);
        color: var(--color-ink-carbon);
    }
    
    .left-spine,
    .hero-container {
        background-color: var(--color-aged-linen);
    }
    
    .nav-label {
        color: var(--color-ink-carbon);
    }
}

/* Fade-in animation */
@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Scroll-triggered animations - handled by JS */
.scroll-visible {
    opacity: 1;
}