/* ==========================================================================
   PESANTREN MIFTAHUL HUDA — DESIGN SYSTEM
   Signature language: "Sanad Illumination" — garis geometris tipis bergaya
   iluminasi mushaf klasik (bukan wave divider generik), dipadukan dengan
   glassmorphism modern & tipografi editorial premium.
   ========================================================================== */

:root {
    /* --- Warna Utama --- */
    --color-primary: #0F766E;
    --color-primary-dark: #115E59;
    --color-primary-darker: #0A4A44;
    --color-accent: #D4AF37;
    --color-accent-soft: #E8CD7A;
    --color-bg: #F8FBF9;
    --color-bg-alt: #EFF7F4;
    --color-ink: #0B2B28;
    --color-ink-soft: #4B6664;
    --color-ink-faint: #7C948F;
    --color-surface: #FFFFFF;
    --color-glass: rgba(255, 255, 255, 0.62);
    --color-glass-border: rgba(255, 255, 255, 0.45);
    --color-line: rgba(15, 118, 110, 0.14);

    /* --- Tipografi --- */
    --font-display: "Fraunces", "Georgia", serif;
    --font-body: "Plus Jakarta Sans", "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", monospace;
    --font-arabic: "Amiri", serif;

    /* --- Bayangan & Radius --- */
    --shadow-soft: 0 8px 30px rgba(15, 118, 110, 0.09);
    --shadow-elevated: 0 20px 60px rgba(11, 43, 40, 0.14);
    --shadow-gold: 0 10px 30px rgba(212, 175, 55, 0.25);
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;

    /* --- Transisi --- */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --dur-fast: 0.25s;
    --dur-med: 0.5s;
    --dur-slow: 0.9s;
}

[data-theme="dark"] {
    --color-bg: #08201D;
    --color-bg-alt: #0C2925;
    --color-ink: #EAF5F2;
    --color-ink-soft: #B9D2CD;
    --color-ink-faint: #82A29C;
    --color-surface: #0E2F2A;
    --color-glass: rgba(14, 47, 42, 0.6);
    --color-glass-border: rgba(255, 255, 255, 0.08);
    --color-line: rgba(212, 175, 55, 0.18);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 96px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-ink);
    transition: background-color var(--dur-med) var(--ease-out), color var(--dur-med) var(--ease-out);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
.font-display {
    font-family: var(--font-display);
}

.font-arabic {
    font-family: var(--font-arabic);
}

.font-mono {
    font-family: var(--font-mono);
}

a {
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

::selection {
    background: var(--color-accent);
    color: var(--color-primary-darker);
}

/* Focus visibility (aksesibilitas) */
:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Scrollbar halus */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 10px;
}

/* Skip link */
.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--color-primary);
    color: #fff;
    padding: 0.75rem 1.25rem;
    z-index: 999;
    border-radius: 0 0 10px 0;
}

.skip-link:focus {
    left: 0;
}

/* ==========================================================================
   LOADING SCREEN
   ========================================================================== */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--color-primary-darker);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s var(--ease-out), visibility 0.6s var(--ease-out);
}

#loading-screen.hide {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-star {
    width: 64px;
    height: 64px;
    animation: spin-star 2.4s linear infinite;
}

@keyframes spin-star {
    to {
        transform: rotate(360deg);
    }
}

/* ==========================================================================
   SCROLL PROGRESS BAR
   ========================================================================== */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
    z-index: 1000;
    width: 0%;
    transition: width 0.1s linear;
}

/* ==========================================================================
   GEOMETRIC PATTERN BACKGROUND (halus, khas naskah islami)
   ========================================================================== */
.pattern-islamic {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='84' height='84' viewBox='0 0 84 84'%3E%3Cg fill='none' stroke='%230F766E' stroke-width='0.6' opacity='0.14'%3E%3Cpath d='M42 4 L66 22 L58 50 L26 50 L18 22 Z'/%3E%3Ccircle cx='42' cy='42' r='10'/%3E%3Cpath d='M42 0 V84 M0 42 H84 M12 12 L72 72 M72 12 L12 72'/%3E%3C/g%3E%3C/svg%3E");
    background-size: 84px 84px;
}

[data-theme="dark"] .pattern-islamic {
    opacity: 0.5;
}

/* ==========================================================================
   BLOBS & FLOATING SHAPES
   ========================================================================== */
.blob {
    position: absolute;
    border-radius: 42% 58% 65% 35% / 45% 40% 60% 55%;
    filter: blur(2px);
    animation: blob-morph 12s var(--ease-out) infinite alternate;
}

@keyframes blob-morph {
    0% {
        border-radius: 42% 58% 65% 35% / 45% 40% 60% 55%;
        transform: rotate(0deg) scale(1);
    }

    50% {
        border-radius: 58% 42% 35% 65% / 55% 65% 35% 45%;
        transform: rotate(8deg) scale(1.04);
    }

    100% {
        border-radius: 50% 50% 42% 58% / 40% 55% 45% 60%;
        transform: rotate(-6deg) scale(0.98);
    }
}

.float-el {
    animation: float-y 6s ease-in-out infinite;
}

.float-el.delay-1 {
    animation-delay: 0.8s;
}

.float-el.delay-2 {
    animation-delay: 1.6s;
}

@keyframes float-y {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-16px);
    }
}

/* ==========================================================================
   GLASSMORPHISM
   ========================================================================== */
.glass {
    background: var(--color-glass);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--color-glass-border);
}

/* ==========================================================================
   NAVBAR
   ========================================================================== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 900;
    transition: background-color var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), padding var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
    background: transparent;
}

#navbar.is-scrolled {
    background: var(--color-glass);
    backdrop-filter: blur(16px) saturate(150%);
    -webkit-backdrop-filter: blur(16px) saturate(150%);
    box-shadow: var(--shadow-soft);
    border-bottom: 1px solid var(--color-line);
}

#navbar.nav-hidden {
    transform: translateY(-100%);
}

.nav-link {
    position: relative;
    padding-bottom: 4px;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--dur-fast) var(--ease-out);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
    width: 100%;
}

/* ==========================================================================
   TOMBOL
   ========================================================================== */
.btn-gold {
    background: linear-gradient(135deg, var(--color-accent) 0%, #C69A2A 100%);
    color: #16342F;
    box-shadow: var(--shadow-gold);
    transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}

.btn-gold:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(212, 175, 55, 0.36);
}

.btn-outline-teal {
    border: 1.5px solid var(--color-primary);
    color: var(--color-primary);
    transition: all var(--dur-fast) var(--ease-out);
}

[data-theme="dark"] .btn-outline-teal {
    color: var(--color-accent-soft);
    border-color: var(--color-accent-soft);
}

.btn-outline-teal:hover {
    background: var(--color-primary);
    color: #fff;
}

.btn-ripple {
    position: relative;
    overflow: hidden;
}

.ripple-span {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.55);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(3.2);
        opacity: 0;
    }
}

/* ==========================================================================
   KARTU
   ========================================================================== */
.card-modern {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--color-line);
    transition: transform var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out);
}

.card-modern:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-elevated);
}

/* Sudut iluminasi khas naskah — elemen signature */
.illum-corner {
    position: relative;
}

.illum-corner::before,
.illum-corner::after {
    content: "";
    position: absolute;
    width: 22px;
    height: 22px;
    border-color: var(--color-accent);
    opacity: 0.85;
}

.illum-corner::before {
    top: 10px;
    left: 10px;
    border-top: 2px solid;
    border-left: 2px solid;
    border-radius: 6px 0 0 0;
}

.illum-corner::after {
    bottom: 10px;
    right: 10px;
    border-bottom: 2px solid;
    border-right: 2px solid;
    border-radius: 0 0 6px 0;
}

/* ==========================================================================
   PEMBATAS BAGIAN — "Sanad Divider" (pengganti wave generik)
   ========================================================================== */
.sanad-divider {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--color-accent);
}

.sanad-divider .line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-line), transparent);
}

.shape-divider-top {
    position: absolute;
    top: -1px;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    transform: rotate(180deg);
}

.shape-divider-bottom {
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

/* ==========================================================================
   SCROLL REVEAL
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

.reveal-scale {
    opacity: 0;
    transform: scale(0.92);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal-scale.is-visible {
    opacity: 1;
    transform: scale(1);
}

/* Stagger delays */
.delay-100 {
    transition-delay: .1s;
}

.delay-200 {
    transition-delay: .2s;
}

.delay-300 {
    transition-delay: .3s;
}

.delay-400 {
    transition-delay: .4s;
}

.delay-500 {
    transition-delay: .5s;
}

/* ==========================================================================
   TIMELINE
   ========================================================================== */
.timeline-line {
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-primary));
}

@media (min-width: 768px) {
    .timeline-line-center {
        left: 50%;
        transform: translateX(-50%);
    }
}

/* ==========================================================================
   EFEK KETIK (Typing Effect)
   ========================================================================== */
.typing-cursor::after {
    content: "|";
    margin-left: 2px;
    animation: blink 1s step-start infinite;
    color: var(--color-accent);
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

/* ==========================================================================
   COUNTER
   ========================================================================== */
.counter-num {
    font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
#back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 800;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all var(--dur-fast) var(--ease-out);
}

#back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ==========================================================================
   LIGHTBOX
   ========================================================================== */
#lightbox {
    position: fixed;
    inset: 0;
    background: rgba(8, 32, 29, 0.92);
    z-index: 1100;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s var(--ease-out), visibility 0.35s var(--ease-out);
}

#lightbox.open {
    opacity: 1;
    visibility: visible;
}

#lightbox img {
    max-height: 82vh;
    border-radius: 12px;
    box-shadow: var(--shadow-elevated);
}

/* ==========================================================================
   ACCORDION FAQ
   ========================================================================== */
.accordion-item {
    border-bottom: 1px solid var(--color-line);
}

.accordion-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out), padding 0.4s var(--ease-out);
}

.accordion-btn[aria-expanded="true"]+.accordion-panel {
    max-height: 480px;
}

.accordion-btn[aria-expanded="true"] .accordion-icon {
    transform: rotate(45deg);
}

.accordion-icon {
    transition: transform var(--dur-fast) var(--ease-out);
}

/* ==========================================================================
   TABS (Program / Unit Pendidikan)
   ========================================================================== */
.tab-btn[aria-selected="true"] {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-soft);
}

/* ==========================================================================
   FORM
   ========================================================================== */
.input-modern {
    background: var(--color-surface);
    border: 1.5px solid var(--color-line);
    transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}

.input-modern:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.12);
    outline: none;
}

/* ==========================================================================
   DARK MODE TOGGLE ICON
   ========================================================================== */
.theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: none;
}

/* ==========================================================================
   UTIL
   ========================================================================== */
.text-gradient {
    background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section-eyebrow {
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-primary);
}

[data-theme="dark"] .section-eyebrow {
    color: var(--color-accent-soft);
}

.lazy-img {
    filter: blur(14px);
    transition: filter 0.6s var(--ease-out);
    background: var(--color-bg-alt);
}

.lazy-img.loaded {
    filter: blur(0);
}

.aspect-video-16-9 {
    aspect-ratio: 16/9;
}

@media (max-width: 767px) {
    html {
        scroll-padding-top: 76px;
    }
}