/* ============================================================
   ÁLBUM DE CUMPLEAÑOS — MARCO
   Premium Vintage Design System
   ============================================================ */

/* ===== RESET ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

/* ===== DESIGN TOKENS ===== */
:root {
    --bg-dark: #2b1a0e;
    --bg-darker: #1a0f06;
    --brown: #3d2208;
    --brown-mid: #4e2e10;
    --gold: #c9a84c;
    --gold-light: #e0c97a;
    --gold-dim: rgba(201,168,76,.35);
    --cream: #f5e6c0;
    --cream-dark: #d4c49e;
    --red-heart: #c0392b;
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Lato', Arial, sans-serif;
    --gold-gradient: linear-gradient(90deg, transparent, var(--gold), transparent);
    --gold-gradient-solid: linear-gradient(135deg, var(--gold), #a8883a);
    --radius: 3px;
    --shadow-card: 0 4px 24px rgba(0,0,0,.35);
    --shadow-glow: 0 0 40px rgba(201,168,76,.08);
    --transition-base: .3s cubic-bezier(.4,0,.2,1);
}

/* ===== BODY ===== */
body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--cream);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== SCROLL REVEAL ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .7s cubic-bezier(.4,0,.2,1), transform .7s cubic-bezier(.4,0,.2,1);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== NAVIGATION ===== */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    background: rgba(26,15,6,.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(201,168,76,.1);
    transform: translateY(-100%);
    transition: transform .4s ease;
}
.nav.visible { transform: translateY(0); }
.nav a {
    color: var(--gold);
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: .7;
    transition: opacity var(--transition-base);
    position: relative;
}
.nav a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0; right: 0;
    height: 1px;
    background: var(--gold);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}
.nav a:hover { opacity: 1; }
.nav a:hover::after { transform: scaleX(1); }

/* ===== SHARED UTILITIES ===== */
.section {
    padding: 80px 24px;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    content-visibility: auto;
    contain-intrinsic-size: auto 600px;
}
.divider {
    height: 1px;
    background: var(--gold-gradient);
    margin: 0 auto;
    max-width: 400px;
}
.ornament {
    text-align: center;
    color: var(--gold);
    font-size: 1rem;
    letter-spacing: 10px;
    font-family: var(--font-serif);
    margin-bottom: 12px;
    opacity: .6;
}
.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 700;
    color: var(--cream);
    text-align: center;
    margin-bottom: 8px;
    letter-spacing: 1px;
}
.section-subtitle {
    text-align: center;
    color: var(--gold);
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1rem;
    margin-bottom: 44px;
    opacity: .8;
}

/* ===== COVER ===== */
#cover {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-darker) 0%, var(--bg-dark) 35%, var(--brown) 100%);
    padding: 60px 24px;
    position: relative;
    overflow: hidden;
}

/* Texture overlay */
#cover::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(201,168,76,.04) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 50%, rgba(201,168,76,.03) 0%, transparent 60%);
    pointer-events: none;
}

/* Gold border frame */
#cover::after {
    content: '';
    position: absolute;
    inset: 20px;
    border: 1px solid var(--gold);
    opacity: .2;
    pointer-events: none;
}

/* Inner frame corners */
.cover-frame {
    position: absolute;
    inset: 20px;
    pointer-events: none;
}
.cover-frame .corner {
    position: absolute;
    width: 30px;
    height: 30px;
    border-color: var(--gold);
    border-style: solid;
    opacity: .5;
}
.cover-frame .corner.tl { top: 0; left: 0; border-width: 2px 0 0 2px; }
.cover-frame .corner.tr { top: 0; right: 0; border-width: 2px 2px 0 0; }
.cover-frame .corner.bl { bottom: 0; left: 0; border-width: 0 0 2px 2px; }
.cover-frame .corner.br { bottom: 0; right: 0; border-width: 0 2px 2px 0; }

.cover-content {
    position: relative;
    z-index: 2;
}

/* Particles canvas */
#particles-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.cover-ornament {
    color: var(--gold);
    letter-spacing: 14px;
    font-size: 1.1rem;
    opacity: .5;
}
.cover-ornament-top { margin-bottom: 36px; }
.cover-ornament-bottom { margin-top: 36px; }

.cover-year {
    font-family: var(--font-serif);
    font-size: .85rem;
    letter-spacing: 6px;
    color: var(--gold);
    opacity: .5;
    margin-bottom: 20px;
}

.cover-name {
    font-family: var(--font-serif);
    font-size: clamp(4rem, 12vw, 8rem);
    font-weight: 900;
    color: var(--cream);
    text-shadow: 0 2px 30px rgba(201,168,76,.2), 0 0 60px rgba(201,168,76,.06);
    line-height: 1;
    margin-bottom: 16px;
    animation: coverFadeIn 1.2s ease backwards;
}
.cover-subtitle {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(1rem, 3vw, 1.4rem);
    color: var(--gold-light);
    margin-bottom: 32px;
    animation: coverFadeIn 1.2s .3s ease backwards;
}
.cover-divider {
    height: 1px;
    width: 160px;
    background: var(--gold-gradient);
    margin: 0 auto 28px;
    animation: coverFadeIn 1.2s .5s ease backwards;
}
.cover-bday {
    font-family: var(--font-sans);
    font-size: .8rem;
    letter-spacing: 7px;
    text-transform: uppercase;
    color: var(--gold);
    font-weight: 700;
    animation: coverFadeIn 1.2s .6s ease backwards;
}

.cover-scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: .4;
    animation: hintBounce 2s infinite;
    z-index: 2;
}
.cover-scroll-hint span {
    font-size: .7rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--gold);
}
.cover-scroll-hint .arrow {
    width: 16px;
    height: 16px;
    border-right: 1.5px solid var(--gold);
    border-bottom: 1.5px solid var(--gold);
    transform: rotate(45deg);
}

@keyframes coverFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes hintBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%      { transform: translateX(-50%) translateY(6px); }
}

/* ===== COVER BACKGROUND MESSAGES ===== */
.cover-bg-messages {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}
.cover-bg-text {
    position: absolute;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--gold);
    white-space: nowrap;
    pointer-events: none;
    animation: floatText linear infinite;
    text-shadow: 0 0 20px rgba(201,168,76,.15);
}

@keyframes floatText {
    0%   { transform: translateX(0) translateY(0); opacity: 0; }
    10%  { opacity: var(--float-opacity, .12); }
    90%  { opacity: var(--float-opacity, .12); }
    100% { transform: translateX(var(--drift-x, 40px)) translateY(var(--drift-y, -60px)); opacity: 0; }
}

/* ===== BUTTONS ===== */
.btn-gold {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gold-gradient-solid);
    color: var(--bg-dark);
    border: none;
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: .85rem;
    padding: 13px 32px;
    border-radius: var(--radius);
    cursor: pointer;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    transition: filter .25s, transform .25s, box-shadow .25s;
    box-shadow: 0 2px 12px rgba(201,168,76,.15);
}
.btn-gold:hover {
    filter: brightness(1.12);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(201,168,76,.25);
}
.btn-gold:active { transform: translateY(0); }
.btn-center { text-align: center; margin-top: 32px; }

/* ===== MESSAGES / DEDICATORIAS ===== */
.message-list { display: flex; flex-direction: column; gap: 16px; }

.message-card {
    border-left: 4px solid var(--gold);
    background: linear-gradient(135deg, rgba(61,34,8,.5), rgba(61,34,8,.3));
    padding: 24px 28px;
    border-radius: 0 var(--radius) var(--radius) 0;
    animation: fadeSlideIn .5s ease;
    position: relative;
    box-shadow: var(--shadow-card);
}
.message-card::before {
    content: '"';
    position: absolute;
    top: 8px; left: 20px;
    font-family: var(--font-serif);
    font-size: 3rem;
    color: var(--gold);
    opacity: .12;
    line-height: 1;
}
.message-author {
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--gold);
    font-size: 1rem;
    margin-bottom: 8px;
}
.message-text {
    font-style: italic;
    color: var(--cream-dark);
    font-size: .95rem;
    line-height: 1.8;
    padding-left: 2px;
}
.message-date {
    font-size: .7rem;
    color: var(--gold);
    opacity: .4;
    margin-top: 10px;
    text-align: right;
    letter-spacing: 1px;
}

.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    font-family: var(--font-serif);
    font-size: .85rem;
    color: var(--gold);
    margin-bottom: 6px;
    letter-spacing: .5px;
}
.input-vintage, .textarea-vintage {
    width: 100%;
    background: rgba(245,230,192,.06);
    border: 1px solid rgba(201,168,76,.3);
    border-radius: var(--radius);
    color: var(--cream);
    font-family: var(--font-sans);
    font-size: .95rem;
    padding: 12px 16px;
    outline: none;
    transition: border-color var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}
.input-vintage:focus, .textarea-vintage:focus {
    border-color: var(--gold);
    background: rgba(245,230,192,.1);
    box-shadow: 0 0 0 3px rgba(201,168,76,.08);
}
.input-vintage::placeholder, .textarea-vintage::placeholder {
    color: rgba(245,230,192,.3);
}
.textarea-vintage { resize: vertical; min-height: 100px; line-height: 1.7; }

.message-form {
    background: linear-gradient(135deg, rgba(61,34,8,.35), rgba(61,34,8,.2));
    border: 1px solid rgba(201,168,76,.12);
    padding: 28px;
    border-radius: var(--radius);
    margin-top: 36px;
    box-shadow: inset 0 1px 0 rgba(201,168,76,.05);
}
.message-form-title {
    font-family: var(--font-serif);
    font-size: .9rem;
    color: var(--gold);
    text-align: center;
    margin-bottom: 20px;
    opacity: .7;
    letter-spacing: 2px;
}

/* ===== LOVE CARDS ===== */
.love-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 18px;
}
.love-card {
    background: linear-gradient(135deg, rgba(61,34,8,.55), rgba(61,34,8,.35));
    border: 1px solid rgba(201,168,76,.18);
    border-radius: var(--radius);
    padding: 24px 18px;
    text-align: center;
    animation: fadeSlideIn .45s ease;
    transition: transform .25s, border-color .25s, box-shadow .25s;
    box-shadow: var(--shadow-card);
}
.love-card:hover {
    transform: translateY(-4px);
    border-color: var(--gold);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}
.love-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    display: block;
}
.love-text {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: .9rem;
    color: var(--cream-dark);
    line-height: 1.5;
}
.love-form {
    display: flex;
    gap: 10px;
    max-width: 520px;
    margin: 32px auto 0;
}
.love-form .input-vintage { flex: 1; }
.btn-add {
    width: 46px;
    height: 46px;
    background: var(--gold-gradient-solid);
    color: var(--bg-dark);
    border: none;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: var(--radius);
    cursor: pointer;
    transition: filter .25s, transform .25s;
    flex-shrink: 0;
    line-height: 1;
}
.btn-add:hover { filter: brightness(1.15); transform: translateY(-1px); }

/* ===== LIGHTBOX ===== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(10,6,3,.92);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity .35s, visibility .35s;
    cursor: zoom-out;
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border: 3px solid var(--gold-dim);
    border-radius: var(--radius);
    box-shadow: 0 0 80px rgba(0,0,0,.6);
    transform: scale(.9);
    transition: transform .35s ease;
}
.lightbox.open img { transform: scale(1); }
.lightbox-close {
    position: absolute;
    top: 24px; right: 28px;
    background: none;
    border: 1px solid var(--gold-dim);
    color: var(--gold);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}
.lightbox-close:hover { background: rgba(201,168,76,.15); }
.lightbox-caption {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--cream);
    font-size: .95rem;
    opacity: .7;
    text-align: center;
    max-width: 80%;
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--brown-mid);
    border: 1px solid var(--gold-dim);
    color: var(--cream);
    font-family: var(--font-sans);
    font-size: .85rem;
    padding: 12px 28px;
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0,0,0,.4);
    z-index: 300;
    opacity: 0;
    transition: opacity .3s, transform .3s;
    pointer-events: none;
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== FOOTER ===== */
#footer {
    background: linear-gradient(180deg, var(--bg-dark), var(--brown));
    text-align: center;
    padding: 56px 24px;
    border-top: 1px solid rgba(201,168,76,.12);
    position: relative;
}
#footer::before {
    content: '';
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 1px;
    background: var(--gold);
    opacity: .3;
}
.footer-text {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--gold);
    font-size: 1.1rem;
    margin-bottom: 16px;
    line-height: 1.6;
}
.footer-hearts {
    color: var(--gold);
    letter-spacing: 12px;
    font-size: .85rem;
    opacity: .35;
    margin-bottom: 20px;
}
.footer-credit {
    font-size: .7rem;
    color: var(--gold);
    opacity: .25;
    letter-spacing: 2px;
    text-transform: uppercase;
}
.footer-author {
    margin-top: 8px;
    padding-top: 16px;
    border-top: 1px solid rgba(201,168,76,.1);
}
.footer-author-label {
    font-family: var(--font-sans);
    font-size: .7rem;
    color: var(--gold);
    opacity: .35;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 4px;
}
.footer-author-name {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gold-light);
    letter-spacing: 1px;
    margin-bottom: 4px;
}
.footer-author-msg {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: .85rem;
    color: var(--cream-dark);
    opacity: .6;
}

/* ===== CONTINUOUS CAROUSEL — Double Ribbon ===== */
.carousel-section {
    padding: 80px 0;
    overflow: hidden;
    position: relative;
}
.carousel-section .section {
    padding-bottom: 0;
}
.carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent);
    margin-bottom: 20px;
}
.carousel-reverse {
    margin-bottom: 0;
}
.carousel-track {
    display: flex;
    gap: 24px;
    width: max-content;
    animation: carouselScroll var(--scroll-duration, 60s) linear infinite;
    will-change: transform;
    contain: layout style;
}
.carousel-track:hover {
    animation-play-state: paused;
}
.carousel-track-reverse {
    animation: carouselScrollReverse var(--scroll-duration-reverse, 70s) linear infinite;
    will-change: transform;
    contain: layout style;
}
.carousel-track-reverse:hover {
    animation-play-state: paused;
}

/* Photo frame design */
.carousel-slide {
    flex-shrink: 0;
    width: 300px;
    height: 230px;
    border: 3px solid rgba(201,168,76,.35);
    border-radius: var(--radius);
    overflow: hidden;
    background: linear-gradient(135deg, #1a0f06, #2b1a0e);
    box-shadow: var(--shadow-card);
    transition: transform .4s ease, border-color .4s ease, box-shadow .4s ease;
    cursor: zoom-in;
    position: relative;
    padding: 10px;
    transform: translateZ(0);
}
/* Inner mat border — photo frame effect */
.carousel-slide::before {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid rgba(201,168,76,.15);
    pointer-events: none;
    z-index: 3;
}
/* Corner ornaments */
.carousel-slide::after {
    content: '';
    position: absolute;
    inset: 3px;
    border: 1px solid rgba(201,168,76,.06);
    pointer-events: none;
    border-radius: 1px;
}
.carousel-slide:hover {
    transform: scale(1.06) translateY(-6px);
    border-color: var(--gold);
    box-shadow:
        0 16px 50px rgba(0,0,0,.5),
        var(--shadow-glow),
        inset 0 0 30px rgba(0,0,0,.3),
        0 0 0 1px rgba(201,168,76,.2);
    z-index: 2;
}
.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 1px;
    transition: transform .6s ease;
    user-select: none;
    -webkit-user-drag: none;
}
.carousel-slide:hover img {
    transform: scale(1.05);
}

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

/* ===== ANIMATIONS ===== */
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

/* Tablets */
@media (max-width: 900px) {
    .section { padding: 64px 20px; }
    .carousel-slide { width: 240px; height: 185px; padding: 8px; }
    .love-grid { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
    .nav { gap: 20px; }
    .nav a { font-size: .75rem; letter-spacing: 1.5px; }
    .carousel-section { padding: 64px 0; }
}

/* Mobile */
@media (max-width: 600px) {
    .section { padding: 48px 16px; }
    .love-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .love-card { padding: 18px 12px; }
    .love-icon { font-size: 1.6rem; }
    .love-text { font-size: .82rem; }
    .message-card { padding: 18px 18px; }
    .message-form { padding: 20px 14px; }

    .carousel-section { padding: 40px 0; }
    .carousel { margin-bottom: 14px; }
    .carousel-slide { width: 180px; height: 145px; padding: 6px; border-width: 2px; }
    .carousel-track { gap: 14px; }

    .nav { gap: 14px; height: 48px; padding: 0 12px; }
    .nav a { font-size: .7rem; letter-spacing: 1px; }
    .cover-scroll-hint { bottom: 16px; }

    .section-title { margin-bottom: 6px; }
    .section-subtitle { margin-bottom: 32px; }

    .love-form { flex-direction: column; }
    .love-form .btn-add { width: 100%; height: 44px; }

    .btn-gold { padding: 11px 22px; font-size: .8rem; letter-spacing: 1px; }

    .cover-bg-text { font-size: .65rem !important; }
}

/* Small phones */
@media (max-width: 380px) {
    .love-grid { grid-template-columns: 1fr; }
    .cover-name { font-size: clamp(3rem, 14vw, 5rem); }
    .nav a { font-size: .6rem; }
    .carousel-slide { width: 150px; height: 120px; padding: 5px; }
}