/* =====================================================================
   Suwan Language Institute
   Custom styles (complements the Tailwind CDN utility classes)
   ===================================================================== */

/* ---------- Base Styling & Washi Paper Texture ---------- */
body {
    background-color: #F8F6F2;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    color: #1F1F1F;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.dark body {
    background-color: #121212;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.02'/%3E%3C/svg%3E");
    color: #F8F6F2;
}

/* ---------- Glassmorphism (Shoji Screen vibe) ---------- */
.glass-nav {
    background: rgba(248, 246, 242, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.dark .glass-nav {
    background: rgba(18, 18, 18, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.glass-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.dark .glass-card {
    background: rgba(30, 30, 30, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ---------- Scroll Reveal Animations ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.5, 0, 0, 1), transform 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .sakura-petal { display: none !important; }
    * {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* ---------- Sakura Petal Animation ---------- */
/* Deeper sakura pink — identical in both light and dark themes. */
.sakura-petal {
    position: absolute;
    background-color: #E86A99;
    border-radius: 15px 0px 15px 0px;
    opacity: 0.8 !important;
    pointer-events: none;
    z-index: 10;
    animation: fall linear forwards;
}

@keyframes fall {
    to {
        transform: translateY(105vh) rotate(720deg) translateX(100px);
        opacity: 0;
    }
}

/* ---------- Custom Scrollbar ---------- */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #F8F6F2;
}
.dark ::-webkit-scrollbar-track {
    background: #121212;
}
::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #BC002D;
}

/* ---------- Hero Background Gradient Mask ---------- */
.hero-bg {
    background: linear-gradient(135deg, rgba(248, 246, 242, 0.9) 0%, rgba(248, 246, 242, 0.4) 100%),
                url('https://images.unsplash.com/photo-1493976040374-85c8e12f0c0e?q=80&w=2070&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
}

.dark .hero-bg {
    background: linear-gradient(135deg, rgba(18, 18, 18, 0.95) 0%, rgba(18, 18, 18, 0.7) 100%),
                url('https://images.unsplash.com/photo-1493976040374-85c8e12f0c0e?q=80&w=2070&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
}

/* ---------- Rotating hero city backdrops (Tokyo, Kyoto, Osaka, Kyushu…) ---------- */
.hero-slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.8s ease-in-out;
    will-change: opacity, transform;
}
.hero-slide.is-active {
    opacity: 1;
    animation: heroZoom 9s ease-out forwards;
}
@keyframes heroZoom {
    from { transform: scale(1.08); }
    to   { transform: scale(1); }
}
.hero-overlay {
    background: linear-gradient(135deg, rgba(248, 246, 242, 0.92) 0%, rgba(248, 246, 242, 0.45) 100%);
}
.dark .hero-overlay {
    background: linear-gradient(135deg, rgba(18, 18, 18, 0.95) 0%, rgba(18, 18, 18, 0.6) 100%);
}

/* ---------- Global falling sakura layer (fixed, floats over every page) ---------- */
#sakura-global {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 35;
}

/* ---------- Hide scrollbar for horizontal scroll containers ---------- */
.hide-scrollbar::-webkit-scrollbar {
    display: none;
}
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* ---------- Japanese Vertical Text ---------- */
.tategaki {
    writing-mode: vertical-rl;
    text-orientation: upright;
}

/* ---------- Traditional Link Hover (brush-stroke feel) ---------- */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #BC002D;
    transition: width 0.4s cubic-bezier(0.5, 0, 0, 1);
}
.nav-link:hover::after {
    width: 100%;
}

/* ---------- "Show more" progressive reveal ---------- */
.more-item {
    display: none;
}
.reveal-more .more-item {
    display: block;
}
.show-more-btn .less-label {
    display: none;
}
.show-more-btn[aria-expanded="true"] .more-label {
    display: none;
}
.show-more-btn[aria-expanded="true"] .less-label {
    display: inline;
}
.show-more-icon {
    display: inline-block;
    transition: transform 0.4s cubic-bezier(0.5, 0, 0, 1);
}
.show-more-btn[aria-expanded="true"] .show-more-icon {
    transform: rotate(180deg);
}

/* ---------- Advertisement / Sponsor area ---------- */
.ad-tag {
    font-size: 9px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

/* Sticky corner ad */
#corner-ad {
    transition: transform 0.5s cubic-bezier(0.5, 0, 0, 1), opacity 0.4s ease;
}
#corner-ad.ad-hidden {
    transform: translateY(160%);
    opacity: 0;
    pointer-events: none;
}
@media (prefers-reduced-motion: reduce) {
    #corner-ad { transition: opacity 0.2s ease; }
    #corner-ad.ad-hidden { transform: none; }
}

/* ---------- Hero JLPT level pills (seat availability revealed on hover) ----------
   Status colours reuse the existing palette — accent-bamboo / accent-gold /
   japan-red — and only appear on hover, so the resting design is unchanged. */
.level-pill {
    position: relative;
    transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}
.level-pill:hover,
.level-pill:focus-visible,
.level-pill.is-open {
    transform: translateY(-2px);
}

.seat-tip {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    z-index: 40;
    transition: opacity 0.25s ease, transform 0.25s ease;
}
.level-pill:hover .seat-tip,
.level-pill:focus-visible .seat-tip,
.level-pill.is-open .seat-tip {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Seats available — accent-bamboo (#5C8D63) */
.level-pill.seat-available:hover,
.level-pill.seat-available:focus-visible,
.level-pill.seat-available.is-open {
    color: #5C8D63;
    border-color: rgba(92, 141, 99, 0.55);
    background-color: rgba(92, 141, 99, 0.12);
}
/* Limited seats — accent-gold (#C9A227) */
.level-pill.seat-limited:hover,
.level-pill.seat-limited:focus-visible,
.level-pill.seat-limited.is-open {
    color: #C9A227;
    border-color: rgba(201, 162, 39, 0.55);
    background-color: rgba(201, 162, 39, 0.12);
}
/* Fully booked — japan-red (#BC002D) */
.level-pill.seat-full:hover,
.level-pill.seat-full:focus-visible,
.level-pill.seat-full.is-open {
    color: #BC002D;
    border-color: rgba(188, 0, 45, 0.55);
    background-color: rgba(188, 0, 45, 0.12);
}

@media (prefers-reduced-motion: reduce) {
    .level-pill,
    .seat-tip { transition: none; }
    .level-pill:hover,
    .level-pill:focus-visible,
    .level-pill.is-open { transform: none; }
}

/* ---------- Navbar dropdown menus ---------- */
.nav-dd-menu {
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, 6px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}
.nav-dd:hover .nav-dd-menu,
.nav-dd:focus-within .nav-dd-menu {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}
/* The parent link's underline shouldn't run under the caret */
.nav-dd > .nav-link::after { display: none; }

@media (prefers-reduced-motion: reduce) {
    .nav-dd-menu { transition: none; }
}

/* ---------- Photo gallery (three crossfading blocks) ---------- */
.gallery-block img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1.1s ease;
}
.gallery-block img.is-visible {
    opacity: 1;
}
.gallery-block:hover img.is-visible {
    transform: scale(1.03);
}
.gallery-block img.is-visible {
    transition: opacity 1.1s ease, transform 0.8s ease;
}
@media (prefers-reduced-motion: reduce) {
    .gallery-block img { transition: none; }
    .gallery-block:hover img.is-visible { transform: none; }
}

/* ---------- All-sponsors side panel ----------
   Slides in from the left. Deliberately has no overlay and never locks
   body scrolling, so visitors can keep browsing while it is open. */
#sponsor-panel {
    transition: transform 0.45s cubic-bezier(0.5, 0, 0, 1);
}
#sponsor-panel.panel-hidden {
    transform: translateX(-100%);
}
@media (prefers-reduced-motion: reduce) {
    #sponsor-panel { transition: none; }
}

/* Ad detail modal and contact send-via chooser */
#ad-modal.is-open,
#send-modal.is-open {
    opacity: 1;
    visibility: visible;
}
#ad-modal.is-open #ad-modal-card,
#send-modal.is-open #send-modal-card {
    transform: translateY(0);
}

/* Rotating corner-ad indicator dots */
.ad-dot {
    width: 6px;
    height: 6px;
    padding: 0;
    border: 0;
    border-radius: 9999px;
    background: rgba(0, 0, 0, 0.15);
    cursor: pointer;
    transition: width 0.3s ease, background 0.3s ease;
}
.dark .ad-dot {
    background: rgba(255, 255, 255, 0.2);
}
.ad-dot.active {
    width: 18px;
    background: #BC002D;
}

@media (prefers-reduced-motion: reduce) {
    #ad-modal,
    #ad-modal-card,
    #send-modal,
    #send-modal-card { transition: none; }
}