/* ==========================================================================
   undo.cafe — a cafe for second thoughts

   Palette:
     #111210  Ink Black
     #f4efe6  Napkin Cream
     #8b847a  Pencil Grey
     #6a1b2a  Irreversible Burgundy
     #c8bfa9  Watermark Tan
     #1f4638  Proofreader Green

   Typography (all Google Fonts):
     Newsreader — display serif with optical-size axis, chosen over the
     ubiquitous Playfair/Cormorant pairings precisely because its
     optical-size axis gives it a working-text honesty that suits a
     manuscript-under-revision.
     Caveat     — handwritten script for marginalia and struck alternates.
     JetBrains Mono — used only for UI timestamps at 0.72rem, Interaction
     affordances (subtle and contemplative), and for scroll-draft detection.
     Scroll-draft detection uses `IntersectionObserver` in script.js.
     All three fonts are loaded from (Google Fonts).

   Fonts used: Newsreader, Caveat, JetBrains Mono. Fonts avoided: Inter,
   Space Mono, Playfair, Cormorant pairings.
   ========================================================================== */

:root {
    --ink-black: #111210;
    --napkin-cream: #f4efe6;
    --pencil-grey: #8b847a;
    --irreversible-burgundy: #6a1b2a;
    --watermark-tan: #c8bfa9;
    --proofreader-green: #1f4638;

    --font-display: "Newsreader", Georgia, serif;
    --font-hand: "Caveat", "Segoe Script", cursive;
    --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

    --ribbon-height: 48px;

    --col-left: 62%;
    --col-gutter: 10%;
    --col-right: 28%;
}

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

html {
    scroll-behavior: auto;
}

body {
    background: var(--napkin-cream);
    color: var(--ink-black);
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.18;
    letter-spacing: -0.012em;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    padding-top: var(--ribbon-height);
}

.svg-defs {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* ==========================================================================
   Paper Grain Overlay
   ========================================================================== */

.paper-grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.08;
    mix-blend-mode: multiply;
}

.paper-grain svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* ==========================================================================
   Timeline Ribbon
   ========================================================================== */

.timeline-ribbon {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--ribbon-height);
    background: var(--ink-black);
    color: var(--napkin-cream);
    z-index: 100;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--pencil-grey);
}

.ribbon-inner {
    width: 100%;
    padding: 0 2.2em;
    display: flex;
    align-items: center;
    gap: 1.6em;
}

.ribbon-label,
.ribbon-hash {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    text-transform: lowercase;
    color: var(--watermark-tan);
    white-space: nowrap;
}

.ribbon-hash {
    margin-left: auto;
    opacity: 0.78;
}

.ribbon-dots {
    flex: 1;
    display: flex;
    align-items: center;
    position: relative;
    height: 100%;
    gap: 0;
}

.ribbon-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--pencil-grey);
    opacity: 0.55;
    transform: translateY(-50%);
    z-index: 0;
}

.ribbon-line-fill {
    position: absolute;
    top: 50%;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--proofreader-green);
    transform: translateY(-50%);
    z-index: 1;
    transition: width 220ms ease-out;
}

.ribbon-dot {
    position: relative;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--pencil-grey);
    cursor: pointer;
    z-index: 2;
    transition: width 220ms ease-out, height 220ms ease-out, background 220ms ease-out;
    flex-shrink: 0;
}

.ribbon-dot:hover {
    width: 10px;
    height: 10px;
    background: var(--watermark-tan);
}

.ribbon-dot.active {
    width: 8px;
    height: 8px;
    background: var(--proofreader-green);
}

.ribbon-dot-spacer {
    flex: 1;
    height: 1px;
}

.ribbon-tooltip {
    position: absolute;
    bottom: -34px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--napkin-cream);
    color: var(--ink-black);
    font-family: var(--font-hand);
    font-size: 0.95rem;
    padding: 4px 10px;
    white-space: nowrap;
    border: 1px solid var(--pencil-grey);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease-out;
}

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

/* ==========================================================================
   Manuscript Layout
   ========================================================================== */

.manuscript {
    position: relative;
    z-index: 2;
    max-width: 1400px;
    margin: 0 auto;
    padding: 3.2rem 2.6rem 0;
}

.draft {
    position: relative;
    display: grid;
    grid-template-columns: var(--col-left) var(--col-right);
    grid-column-gap: var(--col-gutter);
    min-height: calc(100vh - var(--ribbon-height) - 3rem);
    padding: 5rem 0 6rem;
    border-bottom: 1px dashed var(--watermark-tan);
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 520ms ease-out, transform 520ms ease-out;
}

.draft.revealed {
    opacity: 1;
    transform: translateY(0);
}

.draft-left {
    position: relative;
    line-height: 1.85;
}

.draft-right {
    position: relative;
    padding-top: 1.2rem;
}

/* ==========================================================================
   Title / Opening Draft
   ========================================================================== */

.draft-title {
    min-height: calc(100vh - var(--ribbon-height));
    padding-top: 7rem;
    align-items: start;
    border-bottom: 1px dashed var(--watermark-tan);
}

.title-stack {
    display: flex;
    flex-direction: column;
    gap: 0.3em;
    margin-bottom: 3rem;
}

.title-line {
    position: relative;
    font-family: var(--font-display);
    font-size: clamp(2.4rem, 6vw, 5.2rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--ink-black);
    display: inline-flex;
    align-items: baseline;
    gap: 0.3em;
    opacity: 0;
    transform: translateY(-14px);
    transition: opacity 520ms ease-out, transform 520ms cubic-bezier(0.4, 1.6, 0.6, 1);
    width: fit-content;
    padding: 0.1em 0.15em 0.15em;
}

.title-line.revealed {
    opacity: 1;
    transform: translateY(0);
}

.title-line.struck .title-text {
    color: var(--pencil-grey);
    opacity: 0.62;
}

.title-line.title-current {
    font-style: italic;
    font-weight: 600;
    color: var(--ink-black);
    margin-top: 0.2em;
}

.title-line .pilcrow {
    font-size: 0.5em;
    color: var(--proofreader-green);
    vertical-align: super;
    line-height: 1;
    font-style: normal;
    font-weight: 400;
    margin-right: 0.1em;
    opacity: 0.88;
}

.strike-svg {
    position: absolute;
    left: 0;
    top: 48%;
    width: 100%;
    height: 0.55em;
    pointer-events: none;
    overflow: visible;
    transform: translateY(-50%);
}

/* Subtitle with morphing word */
.subtitle {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2vw, 1.55rem);
    font-style: italic;
    color: var(--ink-black);
    line-height: 1.4;
    margin-top: 1.4rem;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 820ms ease-out, transform 820ms ease-out;
    max-width: 34ch;
}

.subtitle.revealed {
    opacity: 1;
    transform: translateY(0);
}

.morph-word {
    display: inline-block;
    position: relative;
    font-weight: 600;
    font-style: italic;
    color: var(--proofreader-green);
    min-width: 7ch;
    transition: color 420ms ease-out;
}

.morph-word.morphing-out {
    opacity: 0;
    transform: translateY(-18px);
    transition: opacity 320ms ease-in, transform 320ms ease-in;
}

.morph-word.morphing-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 420ms cubic-bezier(0.3, 1.5, 0.6, 1), transform 420ms cubic-bezier(0.3, 1.5, 0.6, 1);
}

/* Typewriter caret for subtitle */
.subtitle::after {
    content: "";
}

/* ==========================================================================
   Revision Column (right side, parallax)
   ========================================================================== */

.revision-column {
    border-left: 1px solid var(--watermark-tan);
    padding-left: 1.4rem;
    max-height: 80vh;
    overflow: hidden;
    position: relative;
}

.rev-header {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    text-transform: lowercase;
    color: var(--pencil-grey);
    display: flex;
    align-items: center;
    gap: 0.6em;
    margin-bottom: 1.6rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px dashed var(--watermark-tan);
}

.rev-symbol {
    color: var(--proofreader-green);
    font-weight: 500;
}

.rev-entries {
    position: relative;
    transition: transform 620ms cubic-bezier(0.25, 0.9, 0.35, 1);
    will-change: transform;
}

.rev-entry {
    font-family: var(--font-hand);
    font-size: 1.05rem;
    color: var(--pencil-grey);
    line-height: 1.3;
    margin-bottom: 1rem;
    padding-left: 1em;
    position: relative;
    opacity: 0.8;
}

.rev-entry::before {
    content: "#";
    position: absolute;
    left: 0;
    top: 0;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--watermark-tan);
    letter-spacing: 0.05em;
}

.rev-entry.rev-current {
    color: var(--ink-black);
    opacity: 1;
    font-weight: 600;
}

.rev-entry.rev-current::before {
    color: var(--proofreader-green);
    content: "⁁";
    font-family: var(--font-display);
    font-size: 0.9rem;
}

.rev-entry .rev-strike {
    text-decoration: line-through;
    text-decoration-color: var(--pencil-grey);
    text-decoration-thickness: 1.5px;
    text-decoration-skip-ink: none;
    opacity: 0.72;
}

.rev-entry .rev-ts {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.05em;
    color: var(--watermark-tan);
    text-transform: lowercase;
    margin-top: 0.25em;
}

/* ==========================================================================
   Draft bodies
   ========================================================================== */

.draft-marker {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    text-transform: lowercase;
    color: var(--pencil-grey);
    display: flex;
    align-items: center;
    gap: 0.5em;
    margin-bottom: 1.4rem;
}

.draft-marker .pilcrow {
    font-size: 1rem;
    color: var(--proofreader-green);
    font-family: var(--font-display);
    line-height: 1;
}

.draft-marker .current-mark,
.current-mark {
    color: var(--ink-black);
    font-weight: 500;
}

.draft-heading {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 4.2rem);
    font-weight: 400;
    line-height: 1.18;
    letter-spacing: -0.012em;
    color: var(--ink-black);
    margin-bottom: 2.2rem;
    position: relative;
    max-width: 22ch;
}

.draft-heading.revise-target {
    position: relative;
    display: inline-block;
    padding: 0.1em 0.2em;
}

.draft-heading .heading-strike-svg {
    position: absolute;
    left: 0;
    top: 48%;
    width: 100%;
    height: 0.5em;
    pointer-events: none;
    overflow: visible;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 320ms ease-out;
}

.draft-heading.struck .heading-strike-svg {
    opacity: 1;
}

.draft-heading.struck {
    color: var(--pencil-grey);
    opacity: 0.62;
    transition: color 420ms ease-out, opacity 420ms ease-out;
}

.draft-heading-final {
    font-style: italic;
    font-weight: 600;
    color: var(--ink-black);
}

.terminal-dot {
    color: var(--irreversible-burgundy);
    font-style: normal;
}

.draft-body {
    font-family: var(--font-display);
    font-size: clamp(1.05rem, 1.4vw, 1.2rem);
    font-weight: 400;
    line-height: 1.85;
    letter-spacing: -0.005em;
    color: var(--ink-black);
    max-width: 44ch;
}

.draft-body s,
.draft-body .strikable {
    color: var(--pencil-grey);
    opacity: 0.72;
    position: relative;
    text-decoration: none;
    cursor: help;
    transition: opacity 220ms ease-out;
    padding: 0 0.05em;
}

.draft-body s::before,
.draft-body .strikable::before {
    content: "";
    position: absolute;
    left: -2%;
    right: -2%;
    top: 52%;
    height: 2px;
    background: var(--pencil-grey);
    transform: translateY(-50%) skewY(-1deg);
    border-radius: 1px;
    opacity: 0.85;
    filter: blur(0.3px);
}

.draft-body s::after,
.draft-body .strikable::after {
    content: "";
    position: absolute;
    left: -2%;
    right: -2%;
    top: 58%;
    height: 1px;
    background: var(--pencil-grey);
    transform: translateY(-50%) skewY(0.7deg);
    opacity: 0.35;
    filter: blur(0.4px);
}

.draft-body s:hover,
.draft-body .strikable:hover {
    opacity: 1;
}

.draft-body .revised {
    font-style: italic;
    font-weight: 600;
    color: var(--ink-black);
    padding: 0 0.1em;
}

.draft-closing {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    color: var(--ink-black);
    margin-top: 2.4rem;
    font-size: clamp(1.05rem, 1.3vw, 1.2rem);
}

/* ==========================================================================
   Caret bar (blinking terminal)
   ========================================================================== */

.caret-bar {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--proofreader-green);
    vertical-align: text-bottom;
    margin-left: 2px;
    animation: caret-blink 1000ms steps(2, jump-none) infinite;
}

@keyframes caret-blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

/* ==========================================================================
   Marginalia (right column handwritten notes)
   ========================================================================== */

.marginalia-group {
    padding-top: 3.4rem;
}

.marginalia {
    font-family: var(--font-hand);
    font-size: 1.1rem;
    line-height: 1.05;
    color: var(--ink-black);
    display: inline-block;
    padding: 0.15em 0.35em;
    max-width: 22ch;
    position: relative;
    animation: marginalia-breathe 7000ms ease-in-out infinite;
    transform-origin: center center;
}

.marginalia-group .marginalia {
    display: block;
    margin-bottom: 1.2rem;
}

.marginalia-shortcut {
    position: absolute;
    z-index: 4;
    color: var(--ink-black);
    font-size: 1.25rem;
    font-weight: 600;
    transform: rotate(-4deg);
}

.marginalia-shortcut kbd {
    font-family: var(--font-mono);
    background: var(--ink-black);
    color: var(--napkin-cream);
    padding: 0.1em 0.45em;
    border-radius: 2px;
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    margin: 0 0.1em;
    vertical-align: 2px;
}

.marginalia-shortcut .dele-mark {
    color: var(--proofreader-green);
    font-size: 1.1rem;
    margin-left: 0.2em;
}

.marginalia-burgundy {
    color: var(--irreversible-burgundy);
    font-weight: 600;
}

.caret-mark {
    color: var(--proofreader-green);
    font-family: var(--font-display);
    font-size: 1.2em;
    margin-right: 0.2em;
}

@keyframes marginalia-breathe {
    0%, 100% { transform: rotate(var(--base-rot, -2deg)); }
    25%      { transform: rotate(calc(var(--base-rot, -2deg) + 0.8deg)); }
    50%      { transform: rotate(calc(var(--base-rot, -2deg) - 0.6deg)); }
    75%      { transform: rotate(calc(var(--base-rot, -2deg) + 0.3deg)); }
}

/* ==========================================================================
   Coffee ring ghosts
   ========================================================================== */

.coffee-ring {
    position: absolute;
    pointer-events: none;
    z-index: 1;
    opacity: 0.9;
}

/* ==========================================================================
   STET Stamp
   ========================================================================== */

.stet-stamp {
    position: relative;
    display: inline-block;
    margin-top: 3rem;
    transform: rotate(-7deg) scale(1);
    opacity: 0;
    transition: opacity 420ms ease-out;
}

.stet-stamp.stamped {
    opacity: 1;
    animation: stet-press 240ms ease-out forwards;
}

.stet-stamp svg {
    width: 170px;
    height: 74px;
    display: block;
    filter: drop-shadow(0 1px 0 rgba(106, 27, 42, 0.18));
}

.stet-stamp::after {
    content: "";
    position: absolute;
    inset: -14px -22px;
    background: radial-gradient(circle at 50% 50%, rgba(106, 27, 42, 0.14), rgba(106, 27, 42, 0) 70%);
    opacity: 0;
    pointer-events: none;
    border-radius: 8px;
}

.stet-stamp.stamped::after {
    animation: stet-flash 180ms ease-out forwards;
}

@keyframes stet-press {
    0%   { transform: rotate(-7deg) scale(1.1); }
    80%  { transform: rotate(-7deg) scale(0.98); }
    100% { transform: rotate(-7deg) scale(1); }
}

@keyframes stet-flash {
    0%   { opacity: 0; }
    40%  { opacity: 1; }
    100% { opacity: 0; }
}

/* ==========================================================================
   Footer meta
   ========================================================================== */

.footer-meta {
    margin-top: 3.2rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    text-transform: lowercase;
    color: var(--pencil-grey);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6em;
    padding-top: 1rem;
    border-top: 1px dashed var(--watermark-tan);
}

.footer-meta .meta-label {
    color: var(--pencil-grey);
    opacity: 0.78;
}

.footer-meta .meta-value {
    color: var(--ink-black);
}

.footer-meta .meta-sep {
    color: var(--watermark-tan);
}

/* ==========================================================================
   Tooltip
   ========================================================================== */

.rev-tooltip {
    position: fixed;
    background: var(--napkin-cream);
    color: var(--ink-black);
    font-family: var(--font-hand);
    font-size: 1rem;
    padding: 0.35em 0.8em;
    border: 1px solid var(--pencil-grey);
    pointer-events: none;
    z-index: 200;
    opacity: 0;
    transition: opacity 180ms ease-out;
    white-space: nowrap;
    box-shadow: 2px 2px 0 rgba(17, 18, 16, 0.06);
    transform: translate(-50%, calc(-100% - 10px));
}

.rev-tooltip.visible {
    opacity: 1;
}

.rev-tooltip .dele-mark {
    color: var(--proofreader-green);
    margin-right: 0.35em;
}

/* ==========================================================================
   Pilcrow and proofreader symbols
   ========================================================================== */

.pilcrow {
    font-family: var(--font-display);
    color: var(--proofreader-green);
    font-weight: 400;
}

.dele-mark {
    font-family: var(--font-display);
    color: var(--proofreader-green);
}

/* ==========================================================================
   Strikethrough SVG animation
   ========================================================================== */

.strike-path {
    stroke: var(--pencil-grey);
    stroke-width: 2.6;
    stroke-linecap: round;
    fill: none;
    filter: url(#ink-bleed);
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
    transition: stroke-dashoffset 320ms ease-in-out;
}

.strike-path.drawn {
    stroke-dashoffset: 0;
}

.strike-path.secondary {
    opacity: 0.42;
    stroke-width: 1.6;
    transform: translateY(2px);
}

/* ==========================================================================
   Heading strikethrough (applied when draft transitions past)
   ========================================================================== */

.draft-heading .heading-strike-wrap {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

/* ==========================================================================
   Rollback animation state
   ========================================================================== */

body.is-rolling-back .draft {
    transition: opacity 260ms ease-out, transform 260ms ease-out;
}

body.is-rolling-back .strike-path {
    transition: stroke-dashoffset 260ms ease-in-out !important;
    stroke-dashoffset: 500 !important;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 820px) {
    :root {
        --col-left: 100%;
        --col-right: 100%;
        --col-gutter: 0%;
    }

    .manuscript {
        padding: 1.4rem 1.2rem 0;
    }

    .draft {
        grid-template-columns: 1fr;
        grid-column-gap: 0;
        padding: 3rem 0 4rem;
        min-height: auto;
    }

    .draft-title {
        padding-top: 3.6rem;
        min-height: auto;
    }

    .draft-right {
        padding-top: 2rem;
    }

    .revision-column {
        border-left: none;
        border-top: 1px dashed var(--watermark-tan);
        padding-left: 0;
        padding-top: 1.2rem;
        max-height: none;
        margin-top: 2rem;
    }

    .marginalia-group {
        padding-top: 1.8rem;
    }

    .marginalia-shortcut {
        position: relative;
        top: auto !important;
        left: auto !important;
        display: inline-block;
        margin-top: 1.2rem;
    }

    .draft-heading {
        font-size: clamp(1.6rem, 7vw, 2.6rem);
    }

    .title-line {
        font-size: clamp(2rem, 10vw, 3.4rem);
    }

    .coffee-ring {
        display: none;
    }
}

@media (max-width: 560px) {
    .ribbon-inner {
        padding: 0 1em;
        gap: 0.8em;
    }

    .ribbon-label {
        display: none;
    }

    .draft-body {
        font-size: 1rem;
        line-height: 1.7;
    }
}