/* ============================================================
   historic.day  —  A zen-luxurious chronicle
   Burnt-orange palette, f-pattern layout, leather-texture surface
   ============================================================ */

:root {
    --vellum:      #f5ead6;   /* Primary Background  — Aged Vellum */
    --oxblood:     #3b1c0e;   /* Secondary Background — Deep Oxblood */
    --lamp-black:  #2a1f14;   /* Primary Text — Lamp Black */
    --sienna:      #c4713d;   /* Accent 1 — Burnt Sienna */
    --copper:      #7a5c3a;   /* Accent 2 — Patinated Copper */
    --ember:       #d4572a;   /* Accent 3 — Ember Glow */
    --candle:      #e8a84c;   /* Highlight — Candle Flame */
    --dust:        #b8a48c;   /* Muted — Dust Shadow */
    --worn-leather:#5c3d2e;   /* Folio frame border */
    --card-back:   #eedcc2;

    --col-left-offset: 15vw;
    --col-width: 55vw;
    --margin-width: 30vw;

    --transition-slow: 1.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-med:  0.8s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-flip: 0.6s ease-in-out;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background: var(--vellum);
}

body {
    min-height: 100vh;
    font-family: "Lora", Georgia, "Times New Roman", serif;
    color: var(--lamp-black);
    line-height: 1.85;
    font-size: clamp(1rem, 1.6vw, 1.2rem);

    /* Layered leather-texture foundation */
    background-color: var(--vellum);
    background-image:
        repeating-radial-gradient(circle at 50% 50%, transparent 0, rgba(92, 61, 46, 0.045) 1px, transparent 2px),
        conic-gradient(from 45deg at 30% 70%, rgba(196, 113, 61, 0.035), transparent 25%),
        conic-gradient(from 200deg at 70% 30%, rgba(122, 92, 58, 0.03), transparent 25%),
        repeating-conic-gradient(from 0deg at 50% 50%, rgba(42, 31, 20, 0.015) 0deg, transparent 3deg 6deg),
        radial-gradient(ellipse at 20% 20%, rgba(232, 168, 76, 0.06), transparent 55%),
        radial-gradient(ellipse at 80% 80%, rgba(59, 28, 14, 0.08), transparent 60%);
    background-size: 3px 3px, 140% 140%, 140% 140%, 14px 14px, 100% 100%, 100% 100%;
    background-attachment: fixed;
    overflow-x: hidden;
}

/* ------------------------------------------------------------
   Folio Frame — the bound-book container
   ------------------------------------------------------------ */
.folio-frame {
    position: fixed;
    inset: 0;
    border: 12px solid var(--worn-leather);
    box-shadow:
        inset 0 0 40px rgba(92, 61, 46, 0.3),
        inset 0 0 120px rgba(59, 28, 14, 0.22),
        0 0 0 1px rgba(42, 31, 20, 0.4);
    pointer-events: none;
    z-index: 50;
}

.folio-frame::before,
.folio-frame::after {
    content: "";
    position: absolute;
    inset: 4px;
    border: 1px solid rgba(245, 234, 214, 0.18);
    pointer-events: none;
}

.folio-frame::after {
    inset: 10px;
    border: 1px solid rgba(245, 234, 214, 0.08);
}

/* Folio edge — subtle vertical gradient at the page-fold */
.folio-edge {
    position: fixed;
    top: 12px;
    bottom: 12px;
    left: calc(var(--col-left-offset) + var(--col-width) - 40px);
    width: 80px;
    background: linear-gradient(to right,
        transparent 0%,
        transparent 50%,
        rgba(184, 164, 140, 0.18) 72%,
        rgba(184, 164, 140, 0.35) 88%,
        rgba(92, 61, 46, 0.12) 100%);
    pointer-events: none;
    z-index: 2;
}

/* ------------------------------------------------------------
   Colophon Header — the book's spine
   ------------------------------------------------------------ */
.colophon-header {
    position: fixed;
    top: 12px;
    left: 12px;
    right: 12px;
    height: 60px;
    background: linear-gradient(to bottom,
        rgba(245, 234, 214, 0.92),
        rgba(245, 234, 214, 0.78) 70%,
        rgba(245, 234, 214, 0));
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 40;
    display: flex;
    align-items: center;
    padding: 0 2rem;
}

.colophon-header__inner {
    display: flex;
    align-items: baseline;
    width: 100%;
    gap: 1rem;
    border-bottom: 1px solid var(--dust);
    padding-bottom: 8px;
}

.colophon-header__title {
    font-family: "Cormorant Garamond", "Lora", Georgia, serif;
    font-weight: 600;
    font-size: 1.4rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--lamp-black);
    font-feature-settings: "liga" 1, "onum" 1;
}

.colophon-header__rule {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--dust), transparent);
    margin: 0 0.5rem 4px;
}

.colophon-header__date {
    font-family: "IM Fell English", "Lora", Georgia, serif;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--copper);
    letter-spacing: 0.05em;
}

/* ------------------------------------------------------------
   Primary Reading Column (f-pattern)
   ------------------------------------------------------------ */
.folio {
    position: relative;
    margin-left: var(--col-left-offset);
    width: var(--col-width);
    padding: 160px 0 120px;
    z-index: 5;
}

.folio__preamble {
    margin-bottom: 4rem;
}

.folio__preamble-rubric {
    font-family: "IM Fell English", serif;
    font-style: italic;
    color: var(--copper);
    font-size: 1.1rem;
    letter-spacing: 0.08em;
    margin: 0 0 0.5rem 0;
}

.folio__title {
    font-family: "Cormorant Garamond", Georgia, serif;
    font-weight: 700;
    font-size: clamp(2.8rem, 6.5vw, 5.4rem);
    line-height: 1.05;
    letter-spacing: 0.01em;
    margin: 0 0 2rem 0;
    color: var(--lamp-black);
    font-feature-settings: "liga" 1, "onum" 1, "dlig" 1;
}

.folio__preamble-sub {
    font-family: "Lora", serif;
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1.05rem, 1.5vw, 1.3rem);
    color: var(--copper);
    max-width: 44rem;
    line-height: 1.7;
    margin: 0;
}

/* Section */
.folio__section {
    margin: 2rem 0 4rem;
    scroll-margin-top: 100px;
}

.folio__section-title {
    font-family: "Cormorant Garamond", Georgia, serif;
    font-weight: 600;
    font-size: clamp(2.4rem, 5vw, 4.5rem);
    letter-spacing: 0.03em;
    line-height: 1.1;
    color: var(--lamp-black);
    margin: 0 0 2rem 0;
    font-feature-settings: "liga" 1, "onum" 1;
}

.folio__section p {
    font-family: "Lora", serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.6vw, 1.2rem);
    line-height: 1.85;
    color: var(--lamp-black);
    text-align: justify;
    hyphens: auto;
    -webkit-hyphens: auto;
    margin: 0 0 1.4rem 0;
    text-indent: 1.5em;

    /* progressive reveal default state */
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 1s ease, transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.folio__section p.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* First paragraph of a section — drop cap, no indent */
.folio__section p:first-of-type {
    text-indent: 0;
}

.folio__section p:first-of-type::first-letter {
    font-family: "Cinzel", "Cormorant Garamond", serif;
    font-weight: 700;
    font-size: 4.2em;
    float: left;
    line-height: 0.82;
    padding: 0.08em 0.12em 0 0;
    color: var(--oxblood);
    text-shadow: 1px 1px 0 rgba(196, 113, 61, 0.2);
}

/* ------------------------------------------------------------
   Ornamental Dividers
   ------------------------------------------------------------ */
.ornamental-divider {
    height: 2rem;
    margin: 3rem 0 1rem;
    background-image:
        linear-gradient(to right, transparent, var(--sienna) 10%, var(--sienna) 90%, transparent),
        radial-gradient(circle, var(--sienna) 2px, transparent 3px);
    background-size: 100% 1px, 14px 14px;
    background-position: center, center;
    background-repeat: no-repeat, repeat-x;
}

.ornamental-divider::before,
.ornamental-divider::after {
    display: none;
}

.ornamental-divider {
    position: relative;
    height: 2rem;
    margin: 3rem 0 0.5rem;
    background: none;
}

.ornamental-divider::before {
    content: "";
    display: block;
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 14px;
    transform: translateY(-50%);
    background:
        radial-gradient(circle at 0 50%, var(--sienna) 2px, transparent 3px) 0 center / 40px 14px repeat-x,
        linear-gradient(to right, transparent 0, var(--sienna) 20%, var(--sienna) 80%, transparent) center / 100% 1px no-repeat;
    opacity: 0.85;
}

.ornamental-divider::after {
    content: "\25C6   \25CF   \25AC\25AC\25AC   \25CF   \25C6";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-family: "Cinzel", serif;
    color: var(--sienna);
    font-size: 0.9rem;
    letter-spacing: 0.5em;
    background: var(--vellum);
    padding: 0 1rem;
    white-space: nowrap;
}

.ornamental-divider--final::after {
    content: "\25C6   \2042   \25C6";
}

/* ------------------------------------------------------------
   Section Numerals (Cinzel, centered, flip-in)
   ------------------------------------------------------------ */
.section-numeral {
    text-align: center;
    margin: 0.5rem 0 2.5rem;
    perspective: 600px;
}

.section-numeral span {
    display: inline-block;
    font-family: "Cinzel", serif;
    font-weight: 700;
    font-size: clamp(3rem, 8vw, 7rem);
    line-height: 1;
    color: var(--oxblood);
    letter-spacing: 0.08em;
    opacity: 0;
    transform: perspective(600px) rotateX(-90deg);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
    text-shadow: 2px 3px 0 rgba(196, 113, 61, 0.18);
}

.section-numeral.is-visible span {
    opacity: 1;
    transform: perspective(600px) rotateX(0deg);
}

/* ------------------------------------------------------------
   Marginalia  — fixed right column
   ------------------------------------------------------------ */
.marginalia {
    position: fixed;
    top: 80px;
    bottom: 40px;
    right: 20px;
    width: calc(var(--margin-width) - 40px);
    pointer-events: none;
    z-index: 10;
}

.margin-note,
.flip-card {
    position: absolute;
    pointer-events: auto;
    opacity: 0;
    transform: translateX(24px) rotate(var(--rot, 0deg));
    transition: opacity var(--transition-med), transform var(--transition-med);
}

.margin-note.is-visible,
.flip-card.is-visible {
    opacity: var(--target-opacity, 0.65);
    transform: translateX(0) rotate(var(--rot, 0deg));
}

.flip-card.is-visible {
    opacity: 1;
}

/* Individual positioning (roughly staggered down the right column) */
.margin-note--1 { top: 4%;  left: 6%;  --rot: -1.2deg; max-width: 70%; }
.flip-card--1   { top: 14%; left: 25%; --rot:  1.8deg; }

.margin-note--2 { top: 26%; left: 2%;  --rot:  1deg; max-width: 68%; }
.flip-card--2   { top: 32%; left: 40%; --rot: -2deg; }

.margin-note--3 { top: 44%; left: 10%; --rot: -1.6deg; max-width: 72%; }
.flip-card--3   { top: 52%; left: 28%; --rot:  2.2deg; }

.margin-note--4 { top: 62%; left: 4%;  --rot:  1.5deg; max-width: 70%; }
.flip-card--4   { top: 68%; left: 34%; --rot: -1.1deg; }

.margin-note--5 { top: 80%; left: 8%;  --rot: -1deg; max-width: 70%; }
.flip-card--5   { top: 86%; left: 22%; --rot:  2deg; }

.margin-note--6 { top: 96%; left: 12%; --rot:  1.4deg; max-width: 68%; }

.margin-note {
    font-family: "IM Fell English", "Lora", Georgia, serif;
    font-style: italic;
    font-size: clamp(0.78rem, 1.15vw, 0.95rem);
    line-height: 1.55;
    color: var(--copper);
    --target-opacity: 0.72;
}

.margin-note__date {
    display: block;
    font-family: "Cinzel", serif;
    font-style: normal;
    font-weight: 600;
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    color: var(--sienna);
    margin-bottom: 0.2rem;
    text-transform: uppercase;
}

.margin-note p {
    margin: 0;
    text-align: left;
    font-style: italic;
}

/* ------------------------------------------------------------
   Flip Card (index card)
   ------------------------------------------------------------ */
.flip-card {
    width: 165px;
    height: 105px;
    perspective: 800px;
    cursor: pointer;
}

.flip-card__inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform var(--transition-flip);
    box-shadow: 2px 2px 8px rgba(42, 31, 20, 0.15);
}

.flip-card:hover .flip-card__inner,
.flip-card.is-flipped .flip-card__inner {
    transform: rotateY(180deg);
    box-shadow: -2px 4px 14px rgba(42, 31, 20, 0.28);
}

.flip-card__face {
    position: absolute;
    inset: 0;
    padding: 10px 12px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border: 1px solid rgba(92, 61, 46, 0.25);
    background: var(--card-back);
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
}

.flip-card__face--front {
    background:
        linear-gradient(145deg, rgba(245, 234, 214, 0.6), rgba(238, 220, 194, 0.9)),
        repeating-linear-gradient(0deg, rgba(122, 92, 58, 0.05) 0 1px, transparent 1px 18px),
        var(--card-back);
    border-left: 3px solid var(--ember);
}

.flip-card__face--back {
    transform: rotateY(180deg);
    background:
        linear-gradient(160deg, rgba(238, 220, 194, 0.95), rgba(245, 234, 214, 0.85)),
        var(--card-back);
    border-left: 3px solid var(--sienna);
}

.flip-card__date {
    font-family: "Cinzel", serif;
    font-weight: 600;
    font-size: 0.65rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sienna);
    margin-bottom: 0.3rem;
}

.flip-card__title {
    font-family: "IM Fell English", serif;
    font-style: italic;
    font-weight: 400;
    font-size: 1.2rem;
    color: var(--lamp-black);
    line-height: 1.15;
}

.flip-card__face--back p {
    font-family: "Lora", serif;
    font-weight: 400;
    font-size: 0.78rem;
    line-height: 1.45;
    color: var(--lamp-black);
    margin: 0;
    text-align: left;
}

/* ------------------------------------------------------------
   Particle layer
   ------------------------------------------------------------ */
.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 3;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: var(--candle);
    box-shadow: 0 0 6px rgba(232, 168, 76, 0.45);
    will-change: transform, opacity;
    animation-name: drift;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

@keyframes drift {
    0% {
        transform: translate3d(0, 0, 0);
        opacity: 0;
    }
    10% {
        opacity: var(--p-opacity, 0.3);
    }
    90% {
        opacity: var(--p-opacity, 0.3);
    }
    100% {
        transform: translate3d(var(--p-dx, 120px), var(--p-dy, -600px), 0);
        opacity: 0;
    }
}

/* ------------------------------------------------------------
   Terminal Colophon
   ------------------------------------------------------------ */
.terminal-colophon {
    text-align: center;
    margin: 4rem 0 0;
    padding: 3rem 1rem 2rem;
    background:
        radial-gradient(ellipse at center, rgba(59, 28, 14, 0.08), transparent 65%);
}

.terminal-colophon__ornament {
    margin: 0 auto 1.5rem;
    width: 140px;
    line-height: 0;
}

.terminal-colophon__ornament svg {
    width: 100%;
    height: auto;
    display: block;
}

.terminal-colophon__domain {
    font-family: "Cormorant Garamond", serif;
    font-weight: 600;
    font-size: clamp(1.8rem, 3.6vw, 2.6rem);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--oxblood);
    margin: 0 0 0.5rem;
    font-feature-settings: "liga" 1, "onum" 1;
}

.terminal-colophon__finis {
    font-family: "Cinzel", serif;
    font-weight: 700;
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-style: italic;
    color: var(--sienna);
    letter-spacing: 0.2em;
    margin: 1rem 0 1.5rem;
}

.terminal-colophon__note {
    font-family: "IM Fell English", serif;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--copper);
    max-width: 32rem;
    margin: 0 auto;
    line-height: 1.6;
    opacity: 0.85;
}

/* ------------------------------------------------------------
   Responsive — collapse f-pattern on narrow viewports
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
    :root {
        --col-left-offset: 8vw;
        --col-width: 84vw;
        --margin-width: 0vw;
    }

    .folio-edge { display: none; }

    .marginalia {
        position: relative;
        display: block;
        width: 84vw;
        margin: 0 auto 3rem;
        right: auto;
        top: auto;
        bottom: auto;
        height: auto;
        pointer-events: auto;
    }

    .margin-note,
    .flip-card {
        position: relative;
        display: inline-block;
        vertical-align: top;
        margin: 1rem 0.8rem;
        top: auto !important;
        left: auto !important;
    }

    .margin-note {
        max-width: 16rem;
    }
}

@media (max-width: 640px) {
    body {
        font-size: 1rem;
    }

    .colophon-header {
        padding: 0 1rem;
        height: 50px;
    }

    .colophon-header__title {
        font-size: 1rem;
        letter-spacing: 0.15em;
    }

    .colophon-header__date {
        font-size: 0.75rem;
    }

    .folio {
        padding-top: 110px;
    }

    .flip-card {
        width: 150px;
        height: 100px;
    }

    .folio__section p {
        text-align: left;
    }
}