/* ========================================
   BETTA FISH — LANDING PAGE STYLES
   Water-themed design with deep blues & teals
   ======================================== */

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

:root {
    --c-primary: #0077B6;
    --c-primary-light: #00B4D8;
    --c-primary-dark: #023E8A;
    --c-accent: #FF6B6B;
    --c-accent-warm: #F4A261;
    --c-bg: #F0F7FA;
    --c-bg-dark: #0A1628;
    --c-bg-gradient: #0D1B2A;
    --c-text: #1B2838;
    --c-text-muted: #5A6E80;
    --c-text-light: #E0EAF0;
    --c-border: #C8DAE6;
    --c-card: #FFFFFF;
    --c-card-dark: #111D2E;
    --c-success: #2ECC71;
    --c-warning: #F39C12;
    --c-danger: #E74C3C;

    --ff-heading: 'Cormorant Garamond', Georgia, serif;
    --ff-body: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    --ff-mono: 'JetBrains Mono', monospace;

    --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
    --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
    --fs-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
    --fs-md: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
    --fs-lg: clamp(1.4rem, 1.2rem + 1vw, 2rem);
    --fs-xl: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
    --fs-xxl: clamp(2.5rem, 2rem + 3vw, 5rem);

    --space-xs: 0.5rem; --space-sm: 1rem; --space-md: 1.5rem;
    --space-lg: 2.5rem; --space-xl: 4rem; --space-xxl: 6rem;

    --radius-sm: 8px; --radius-md: 12px; --radius-lg: 20px; --radius-xl: 32px;
    --shadow-sm: 0 2px 8px rgba(0,119,182,0.06);
    --shadow-md: 0 4px 20px rgba(0,119,182,0.1);
    --shadow-lg: 0 8px 40px rgba(0,119,182,0.15);
    --shadow-glow: 0 0 30px rgba(0,180,216,0.3);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: var(--c-primary) var(--c-bg); }
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-primary); border-radius: 4px; }

body {
    font-family: var(--ff-body);
    font-size: var(--fs-base);
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { width: min(1280px, 92%); margin: 0 auto; }

/* --- Preloader --- */
.preloader {
    position: fixed; inset: 0; z-index: 9999;
    background: linear-gradient(135deg, var(--c-bg-dark), var(--c-primary-dark));
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-sm);
    transition: opacity 0.5s, visibility 0.5s;
}
.preloader.hidden { opacity: 0; visibility: hidden; }
.preloader__icon { width: 80px; height: 80px; }
.preloader__bubbles { width: 100%; height: 100%; }
.bubble { fill: var(--c-primary-light); opacity: 0.6; }
.bubble--1 { animation: bubbleUp 2s ease-in-out infinite; }
.bubble--2 { animation: bubbleUp 2s ease-in-out 0.3s infinite; }
.bubble--3 { animation: bubbleUp 2s ease-in-out 0.6s infinite; }
@keyframes bubbleUp {
    0%, 100% { transform: translateY(0); opacity: 0.6; }
    50% { transform: translateY(-30px); opacity: 1; }
}
.preloader__text { font-family: var(--ff-heading); font-size: var(--fs-md); color: var(--c-primary-light); }

/* --- Navigation --- */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: var(--space-sm) 0; transition: var(--transition);
}
.nav--scrolled {
    background: rgba(240, 247, 250, 0.95);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm); padding: var(--space-xs) 0;
}
.nav__container { width: min(1280px, 92%); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.nav__logo { display: flex; align-items: center; gap: var(--space-xs); font-family: var(--ff-heading); font-size: var(--fs-md); font-weight: 700; color: var(--c-primary-dark); transition: var(--transition); }
.nav__logo-icon { font-size: 1.5em; }
.nav__logo:hover { color: var(--c-primary); }
.nav__menu { display: flex; align-items: center; gap: var(--space-xs); }
.nav__link { padding: var(--space-xs) var(--space-sm); font-size: var(--fs-sm); font-weight: 500; color: var(--c-text-muted); border-radius: var(--radius-sm); transition: var(--transition); white-space: nowrap; }
.nav__link:hover, .nav__link.active { color: var(--c-primary); background: rgba(0,119,182,0.08); }
.nav__link--accent { background: var(--c-primary); color: white !important; }
.nav__link--accent:hover { background: var(--c-primary-dark) !important; }
.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav__burger span { display: block; width: 24px; height: 2px; background: var(--c-primary-dark); transition: var(--transition); border-radius: 2px; }
.nav__burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.active span:nth-child(2) { opacity: 0; }
.nav__burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Hero --- */
.hero { position: relative; height: 100vh; min-height: 600px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; }
.hero__bg-img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.05); animation: heroZoom 25s ease-in-out alternate infinite; }
@keyframes heroZoom { 0% { transform: scale(1.05); } 100% { transform: scale(1.15); } }
.hero__overlay {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(10,22,40,0.9) 0%, rgba(2,62,138,0.6) 40%, rgba(0,119,182,0.3) 100%);
}
.hero__particles { position: absolute; inset: 0; z-index: 1; pointer-events: none; }
.hero__content { position: relative; z-index: 2; width: min(1280px, 92%); margin: 0 auto; padding-top: 60px; }
.hero__subtitle { font-family: var(--ff-mono); font-size: var(--fs-sm); color: var(--c-primary-light); text-transform: uppercase; letter-spacing: 3px; margin-bottom: var(--space-sm); }
.hero__title { font-family: var(--ff-heading); font-size: var(--fs-xxl); font-weight: 700; color: white; line-height: 1.1; margin-bottom: var(--space-md); }
.hero__title--accent { color: var(--c-primary-light); font-style: italic; }
.hero__description { font-size: var(--fs-md); color: rgba(255,255,255,0.8); max-width: 550px; margin-bottom: var(--space-lg); line-height: 1.8; }
.hero__actions { display: flex; gap: var(--space-sm); flex-wrap: wrap; }
.hero__scroll-indicator { position: absolute; bottom: var(--space-lg); left: 50%; transform: translateX(-50%); z-index: 2; display: flex; flex-direction: column; align-items: center; gap: var(--space-xs); color: rgba(255,255,255,0.5); font-size: var(--fs-xs); animation: scrollFloat 2s ease-in-out infinite; }
.hero__scroll-mouse { width: 24px; height: 38px; border: 2px solid rgba(255,255,255,0.4); border-radius: 12px; display: flex; justify-content: center; padding-top: 6px; }
.hero__scroll-wheel { width: 3px; height: 8px; background: rgba(255,255,255,0.6); border-radius: 2px; animation: scrollWheel 2s ease-in-out infinite; }
@keyframes scrollFloat { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }
@keyframes scrollWheel { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(8px); } }

/* --- Buttons --- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-xs); padding: 14px 32px; font-family: var(--ff-body); font-size: var(--fs-sm); font-weight: 600; border-radius: var(--radius-xl); border: 2px solid transparent; cursor: pointer; transition: var(--transition); white-space: nowrap; }
.btn--primary { background: var(--c-primary); color: white; border-color: var(--c-primary); }
.btn--primary:hover { background: var(--c-primary-dark); border-color: var(--c-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.btn--outline { background: transparent; color: white; border-color: rgba(255,255,255,0.4); }
.btn--outline:hover { background: white; color: var(--c-primary-dark); border-color: white; transform: translateY(-2px); }
.btn--block { width: 100%; }

/* --- Stats --- */
.stats { background: linear-gradient(135deg, var(--c-primary-dark), var(--c-bg-dark)); padding: var(--space-xl) 0; }
.stats__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); text-align: center; }
.stats__item { display: flex; flex-direction: column; align-items: center; }
.stats__number { font-family: var(--ff-heading); font-size: var(--fs-xl); font-weight: 700; color: var(--c-primary-light); line-height: 1; }
.stats__unit { font-size: var(--fs-sm); color: var(--c-primary-light); opacity: 0.7; margin-top: 2px; }
.stats__label { font-size: var(--fs-xs); color: rgba(255,255,255,0.5); margin-top: var(--space-xs); }

/* --- Section --- */
.section { padding: var(--space-xxl) 0; }
.section--dark { background: var(--c-bg-dark); color: var(--c-text-light); }
.section--gradient { background: linear-gradient(180deg, #E8F4F8 0%, var(--c-bg) 100%); }
.section__header { text-align: center; margin-bottom: var(--space-xl); }
.section__tag { display: inline-block; font-family: var(--ff-mono); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 3px; color: var(--c-primary); background: rgba(0,119,182,0.08); padding: 6px 16px; border-radius: var(--radius-xl); margin-bottom: var(--space-sm); }
.section--dark .section__tag { background: rgba(0,180,216,0.12); color: var(--c-primary-light); }
.section__title { font-family: var(--ff-heading); font-size: var(--fs-xl); font-weight: 700; margin-bottom: var(--space-xs); line-height: 1.2; }
.section__subtitle { font-size: var(--fs-md); color: var(--c-text-muted); max-width: 600px; margin: 0 auto; }
.section--dark .section__subtitle { color: rgba(255,255,255,0.5); }

/* --- About --- */
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); align-items: start; }
.about__image { position: relative; border-radius: var(--radius-lg); overflow: hidden; }
.about__image img { width: 100%; height: 500px; object-fit: cover; transition: var(--transition-slow); }
.about__image:hover img { transform: scale(1.05); }
.about__image-badge { position: absolute; bottom: var(--space-md); left: var(--space-md); background: rgba(0,119,182,0.9); color: white; padding: var(--space-sm) var(--space-md); border-radius: var(--radius-md); backdrop-filter: blur(10px); }
.about__image-badge span { font-family: var(--ff-heading); font-size: var(--fs-lg); font-weight: 700; display: block; }
.about__image-badge small { font-size: var(--fs-xs); opacity: 0.9; }
.about__content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.about__card { background: var(--c-card); padding: var(--space-md); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); transition: var(--transition); border: 1px solid var(--c-border); }
.about__card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--c-primary-light); }
.about__card-icon { font-size: 2rem; margin-bottom: var(--space-sm); }
.about__card h3 { font-family: var(--ff-heading); font-size: var(--fs-md); margin-bottom: var(--space-xs); }
.about__card p { font-size: var(--fs-sm); color: var(--c-text-muted); line-height: 1.7; }

/* --- Varieties --- */
.varieties__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); margin-bottom: var(--space-xl); }
.varieties__card { background: var(--c-card-dark); padding: var(--space-lg); border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,0.06); transition: var(--transition); }
.varieties__card:hover { border-color: var(--c-primary-light); transform: translateY(-4px); }
.varieties__card-num { font-family: var(--ff-heading); font-size: var(--fs-xl); font-weight: 700; color: var(--c-primary); opacity: 0.25; line-height: 1; }
.varieties__card h3 { font-family: var(--ff-heading); font-size: var(--fs-md); color: white; margin: var(--space-xs) 0; }
.varieties__card p { font-size: var(--fs-sm); color: rgba(255,255,255,0.55); line-height: 1.7; }
.colors { text-align: center; }
.colors__title { font-family: var(--ff-heading); font-size: var(--fs-lg); margin-bottom: var(--space-lg); }
.colors__grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: var(--space-md); }
.colors__item { display: flex; flex-direction: column; align-items: center; gap: var(--space-xs); }
.colors__swatch { width: 80px; height: 80px; border-radius: 50%; box-shadow: 0 4px 20px rgba(0,0,0,0.3); transition: var(--transition); border: 3px solid rgba(255,255,255,0.1); }
.colors__item:hover .colors__swatch { transform: scale(1.15); box-shadow: 0 8px 30px rgba(0,0,0,0.4); }
.colors__name { font-weight: 600; font-size: var(--fs-xs); margin-top: var(--space-xs); }

/* --- Aquarium --- */
.aquarium__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.aquarium__card { background: var(--c-card); padding: var(--space-lg); border-radius: var(--radius-md); border: 1px solid var(--c-border); transition: var(--transition); }
.aquarium__card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--c-primary-light); }
.aquarium__card-icon { font-size: 2.5rem; margin-bottom: var(--space-sm); }
.aquarium__card h3 { font-family: var(--ff-heading); font-size: var(--fs-md); margin-bottom: var(--space-xs); }
.aquarium__highlight { display: inline-block; font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--c-primary); background: rgba(0,119,182,0.08); padding: 4px 12px; border-radius: var(--radius-xl); margin-bottom: var(--space-sm); font-weight: 600; }
.aquarium__card p { font-size: var(--fs-sm); color: var(--c-text-muted); margin-bottom: var(--space-sm); line-height: 1.7; }
.aquarium__card ul { padding-left: var(--space-md); }
.aquarium__card li { font-size: var(--fs-xs); color: var(--c-text-muted); padding: 3px 0; list-style: disc; }

/* --- Water --- */
.water__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); margin-bottom: var(--space-xl); }
.water__param { background: var(--c-card); padding: var(--space-lg); border-radius: var(--radius-md); border: 1px solid var(--c-border); text-align: center; transition: var(--transition); }
.water__param:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.water__param-icon { font-size: 2rem; margin-bottom: var(--space-xs); }
.water__param-name { font-family: var(--ff-heading); font-size: var(--fs-base); font-weight: 700; margin-bottom: var(--space-xs); }
.water__param-value { font-family: var(--ff-mono); font-size: var(--fs-lg); font-weight: 700; color: var(--c-primary); margin-bottom: 2px; }
.water__param-optimal { font-size: var(--fs-xs); color: var(--c-primary); margin-bottom: var(--space-sm); }
.water__param p { font-size: var(--fs-xs); color: var(--c-text-muted); text-align: left; line-height: 1.6; }

/* Nitrogen cycle */
.water__cycle { background: var(--c-card); padding: var(--space-xl); border-radius: var(--radius-lg); border: 2px solid var(--c-primary-light); }
.water__cycle h3 { font-family: var(--ff-heading); font-size: var(--fs-md); text-align: center; margin-bottom: var(--space-lg); color: var(--c-primary-dark); }
.water__cycle-steps { display: flex; align-items: flex-start; gap: var(--space-sm); }
.water__cycle-step { flex: 1; text-align: center; }
.water__cycle-num { display: inline-flex; width: 36px; height: 36px; align-items: center; justify-content: center; background: var(--c-primary); color: white; border-radius: 50%; font-weight: 700; margin-bottom: var(--space-xs); }
.water__cycle-step strong { display: block; font-size: var(--fs-sm); margin-bottom: 4px; }
.water__cycle-step p { font-size: var(--fs-xs); color: var(--c-text-muted); }
.water__cycle-arrow { color: var(--c-primary-light); font-size: 1.5rem; margin-top: 4px; flex-shrink: 0; }

/* --- Feeding --- */
.feeding__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin-bottom: var(--space-xl); }
.feeding__type { background: var(--c-card); border-radius: var(--radius-md); border: 1px solid var(--c-border); overflow: hidden; }
.feeding__type-header { display: flex; align-items: center; gap: var(--space-sm); padding: var(--space-md) var(--space-lg); background: rgba(0,119,182,0.04); border-bottom: 1px solid var(--c-border); }
.feeding__type-icon { font-size: 2rem; }
.feeding__type-header h3 { font-family: var(--ff-heading); font-size: var(--fs-md); }
.feeding__type-body { padding: var(--space-lg); }
.feeding__type-body p { font-size: var(--fs-sm); color: var(--c-text-muted); margin-bottom: var(--space-md); }
.feeding__items { display: grid; gap: var(--space-sm); }
.feeding__item { padding: var(--space-sm); background: rgba(0,119,182,0.03); border-radius: var(--radius-sm); }
.feeding__item strong { display: block; font-size: var(--fs-sm); color: var(--c-primary-dark); margin-bottom: 2px; }
.feeding__item span { font-size: var(--fs-xs); color: var(--c-text-muted); }

.feeding__schedule { text-align: center; }
.feeding__schedule h3 { font-family: var(--ff-heading); font-size: var(--fs-lg); margin-bottom: var(--space-lg); }
.feeding__schedule-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }
.feeding__schedule-item { background: var(--c-card); padding: var(--space-lg); border-radius: var(--radius-md); border: 1px solid var(--c-border); transition: var(--transition); }
.feeding__schedule-item:hover { border-color: var(--c-primary-light); transform: translateY(-3px); }
.feeding__schedule-icon { font-size: 2rem; margin-bottom: var(--space-sm); }
.feeding__schedule-item strong { display: block; font-size: var(--fs-sm); margin-bottom: 4px; }
.feeding__schedule-item p { font-size: var(--fs-xs); color: var(--c-text-muted); }

/* --- Compatibility --- */
.compat__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin-bottom: var(--space-lg); }
.compat__column { background: var(--c-card-dark); padding: var(--space-lg); border-radius: var(--radius-md); }
.compat__column h3 { font-family: var(--ff-heading); font-size: var(--fs-md); margin-bottom: var(--space-md); }
.compat__column--good { border: 1px solid rgba(46,204,113,0.3); }
.compat__column--good h3 { color: var(--c-success); }
.compat__column--bad { border: 1px solid rgba(231,76,60,0.3); }
.compat__column--bad h3 { color: var(--c-danger); }
.compat__item { padding: var(--space-sm) 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.compat__item:last-child { border: none; }
.compat__item strong { font-size: var(--fs-sm); color: white; }
.compat__item p { font-size: var(--fs-xs); color: rgba(255,255,255,0.5); margin-top: 2px; }
.compat__warning { background: rgba(243,156,18,0.1); border: 1px solid rgba(243,156,18,0.3); padding: var(--space-md) var(--space-lg); border-radius: var(--radius-md); font-size: var(--fs-sm); color: var(--c-accent-warm); }

/* --- Health --- */
.health__grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: var(--space-xl); align-items: start; }
.health__disease { background: var(--c-card); padding: var(--space-md); border-radius: var(--radius-md); margin-bottom: var(--space-sm); border: 1px solid var(--c-border); transition: var(--transition); }
.health__disease:hover { box-shadow: var(--shadow-sm); }
.health__disease-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); margin-bottom: var(--space-xs); flex-wrap: wrap; }
.health__disease h4 { font-family: var(--ff-heading); font-size: var(--fs-base); }
.health__severity { font-size: var(--fs-xs); padding: 3px 10px; border-radius: var(--radius-xl); font-weight: 600; }
.health__severity--high { background: rgba(231,76,60,0.1); color: var(--c-danger); }
.health__severity--critical { background: rgba(142,36,170,0.1); color: #8E24AA; }
.health__severity--medium { background: rgba(243,156,18,0.1); color: var(--c-warning); }
.health__disease p { font-size: var(--fs-sm); color: var(--c-text-muted); line-height: 1.7; }
.health__sidebar > div { background: var(--c-card); padding: var(--space-lg); border-radius: var(--radius-md); margin-bottom: var(--space-md); border: 1px solid var(--c-border); }
.health__sidebar h3 { font-family: var(--ff-heading); font-size: var(--fs-md); margin-bottom: var(--space-md); }
.health__sidebar ul { padding-left: var(--space-md); }
.health__sidebar li { list-style: disc; font-size: var(--fs-sm); color: var(--c-text-muted); padding: 4px 0; }

/* --- Fun Facts --- */
.funfacts__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.funfacts__item { text-align: center; padding: var(--space-lg); background: var(--c-card); border-radius: var(--radius-md); border: 1px solid var(--c-border); transition: var(--transition); }
.funfacts__item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.funfacts__emoji { font-size: 2.5rem; display: block; margin-bottom: var(--space-sm); }
.funfacts__item h4 { font-family: var(--ff-heading); font-size: var(--fs-base); margin-bottom: var(--space-xs); }
.funfacts__item p { font-size: var(--fs-sm); color: var(--c-text-muted); }

/* --- Gallery --- */
.gallery__grid { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 250px; gap: var(--space-sm); }
.gallery__item { position: relative; border-radius: var(--radius-md); overflow: hidden; cursor: pointer; }
.gallery__item--wide { grid-column: span 2; }
.gallery__item--tall { grid-row: span 2; }
.gallery__item img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition-slow); }
.gallery__item:hover img { transform: scale(1.1); }
.gallery__caption { position: absolute; bottom: 0; left: 0; right: 0; padding: var(--space-md); background: linear-gradient(transparent, rgba(0,0,0,0.8)); color: white; font-size: var(--fs-sm); font-weight: 500; transform: translateY(100%); transition: var(--transition); }
.gallery__item:hover .gallery__caption { transform: translateY(0); }

/* --- Lightbox --- */
.lightbox { position: fixed; inset: 0; z-index: 9999; background: rgba(0,0,0,0.95); display: flex; align-items: center; justify-content: center; flex-direction: column; gap: var(--space-sm); opacity: 0; visibility: hidden; transition: var(--transition); cursor: pointer; }
.lightbox.active { opacity: 1; visibility: visible; }
.lightbox__close { position: absolute; top: var(--space-md); right: var(--space-md); background: none; border: none; color: white; font-size: 2.5rem; cursor: pointer; line-height: 1; transition: var(--transition); }
.lightbox__close:hover { transform: rotate(90deg); }
.lightbox__img { max-width: 90vw; max-height: 80vh; object-fit: contain; border-radius: var(--radius-sm); }
.lightbox__caption { color: rgba(255,255,255,0.7); font-size: var(--fs-sm); }

/* --- Guides --- */
.guides__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.guides__card { background: var(--c-card); padding: var(--space-xl); border-radius: var(--radius-lg); text-align: center; border: 2px solid var(--c-border); transition: var(--transition); }
.guides__card:hover { border-color: var(--c-primary); transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.guides__card-icon { font-size: 3rem; margin-bottom: var(--space-md); }
.guides__card h3 { font-family: var(--ff-heading); font-size: var(--fs-md); margin-bottom: var(--space-sm); }
.guides__card p { font-size: var(--fs-sm); color: var(--c-text-muted); margin-bottom: var(--space-md); line-height: 1.7; }
.guides__card-meta { display: flex; justify-content: center; gap: var(--space-md); font-size: var(--fs-xs); color: var(--c-text-muted); margin-bottom: var(--space-md); }
.guides__card-meta span { background: rgba(0,119,182,0.08); color: var(--c-primary); padding: 3px 10px; border-radius: var(--radius-xl); }

/* --- FAQ --- */
.faq__list { max-width: 800px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--c-border); }
.faq__question { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); padding: var(--space-md) 0; background: none; border: none; cursor: pointer; text-align: left; font-family: var(--ff-heading); font-size: var(--fs-md); color: var(--c-text); font-weight: 600; transition: var(--transition); }
.faq__question:hover { color: var(--c-primary); }
.faq__arrow { width: 24px; height: 24px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: var(--transition); }
.faq__item.active .faq__arrow { transform: rotate(180deg); }
.faq__answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease; }
.faq__item.active .faq__answer { max-height: 300px; padding-bottom: var(--space-md); }
.faq__answer p { font-size: var(--fs-sm); color: var(--c-text-muted); line-height: 1.8; }

/* --- Footer --- */
.footer { background: var(--c-bg-dark); color: var(--c-text-light); padding: var(--space-xl) 0 var(--space-md); }
.footer__content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-xl); padding-bottom: var(--space-xl); border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer__logo { font-family: var(--ff-heading); font-size: var(--fs-lg); font-weight: 700; display: block; margin-bottom: var(--space-sm); }
.footer__brand p { font-size: var(--fs-sm); color: rgba(255,255,255,0.4); max-width: 300px; }
.footer__links h4 { font-family: var(--ff-heading); font-size: var(--fs-base); margin-bottom: var(--space-sm); }
.footer__links a { display: block; font-size: var(--fs-sm); color: rgba(255,255,255,0.4); padding: 4px 0; transition: var(--transition); }
.footer__links a:hover { color: var(--c-primary-light); transform: translateX(4px); }
.footer__bottom { padding-top: var(--space-md); text-align: center; }
.footer__bottom p { font-size: var(--fs-xs); color: rgba(255,255,255,0.25); }

/* --- Back to Top --- */
.back-to-top { position: fixed; bottom: var(--space-lg); right: var(--space-lg); width: 48px; height: 48px; background: var(--c-primary); color: white; border: none; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transform: translateY(20px); transition: var(--transition); box-shadow: var(--shadow-md); z-index: 100; }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--c-primary-dark); transform: translateY(-3px); }
.back-to-top svg { width: 24px; height: 24px; fill: none; stroke: white; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }

/* --- Animations --- */
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .about__grid, .health__grid { grid-template-columns: 1fr; }
    .varieties__grid, .aquarium__grid, .water__grid, .funfacts__grid { grid-template-columns: repeat(2, 1fr); }
    .feeding__grid, .compat__grid { grid-template-columns: 1fr; }
    .guides__grid { grid-template-columns: repeat(2, 1fr); }
    .footer__content { grid-template-columns: 1fr 1fr; }
    .gallery__grid { grid-template-columns: repeat(3, 1fr); grid-auto-rows: 200px; }
    .colors__grid { grid-template-columns: repeat(3, 1fr); }
    .water__cycle-steps { flex-wrap: wrap; }
    .water__cycle-arrow { display: none; }
    .water__cycle-steps { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
}
@media (max-width: 768px) {
    .nav__burger { display: flex; }
    .nav__menu { position: fixed; top: 0; right: -100%; width: 280px; height: 100vh; background: var(--c-bg); flex-direction: column; padding: 80px var(--space-lg) var(--space-lg); box-shadow: var(--shadow-lg); transition: var(--transition); z-index: 999; }
    .nav__menu.active { right: 0; }
    .nav__link { font-size: var(--fs-md); padding: var(--space-sm) 0; }
    .stats__grid { grid-template-columns: repeat(2, 1fr); }
    .about__content { grid-template-columns: 1fr; }
    .varieties__grid, .aquarium__grid, .water__grid, .guides__grid { grid-template-columns: 1fr; }
    .feeding__schedule-grid { grid-template-columns: repeat(2, 1fr); }
    .gallery__grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 180px; }
    .gallery__item--wide { grid-column: span 2; }
    .gallery__item--tall { grid-row: span 1; }
    .footer__content { grid-template-columns: 1fr; }
    .colors__grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
    .funfacts__grid { grid-template-columns: 1fr; }
    .gallery__grid { grid-template-columns: 1fr 1fr; grid-auto-rows: 150px; }
    .gallery__item--wide { grid-column: span 1; }
    .hero__actions { flex-direction: column; }
    .btn { width: 100%; }
    .colors__grid { grid-template-columns: repeat(2, 1fr); }
}