/* ============================================================
   Yuhao Zhou's Homepage — Teyvat-inspired theme
   Palette: starry night + gold + elemental cyan/purple
   ============================================================ */

:root {
    --bg-deep: #0b1026;
    --bg-mid: #1b2350;
    --gold: #d3bc8e;
    --gold-bright: #ffd97a;
    --cyan: #7ee8fa;
    --purple: #c084fc;
    --ink: #e9e4d6;
    --ink-dim: #b8b2a2;
    --panel-bg: rgba(16, 21, 48, 0.74);
    --panel-border: rgba(211, 188, 142, 0.42);
    --font-display: "Cinzel", "Noto Serif SC", serif;
    --font-body: "Noto Serif SC", "Cinzel", serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--ink);
    background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-mid) 55%, #141a3d 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

/* ---------- Starfield ---------- */

#starfield {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Everything above the canvas */
.nav, .hero, .main, .footer {
    position: relative;
    z-index: 1;
}

/* ---------- Navigation ---------- */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 2rem;
    background: rgba(11, 16, 38, 0.62);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(211, 188, 142, 0.25);
    z-index: 100;
}

.nav-brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.08em;
    color: var(--gold);
    text-decoration: none;
    text-shadow: 0 0 14px rgba(255, 217, 122, 0.35);
}

.nav-links {
    display: flex;
    gap: 1.6rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--ink-dim);
    text-decoration: none;
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    transition: color 0.25s, text-shadow 0.25s;
    position: relative;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 1px;
    background: var(--gold-bright);
    transition: width 0.25s;
}

.nav-links a:hover {
    color: var(--gold-bright);
    text-shadow: 0 0 10px rgba(255, 217, 122, 0.5);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--panel-border);
    color: var(--gold);
    font-size: 1.2rem;
    border-radius: 6px;
    padding: 0.15rem 0.6rem;
    cursor: pointer;
}

/* ---------- Hero ---------- */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 3rem;
}

.hero-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.9rem;
}

/* Avatar with rotating golden ring */
.avatar-ring {
    position: relative;
    width: 168px;
    height: 168px;
    border-radius: 50%;
    padding: 5px;
    background: conic-gradient(from 0deg,
            var(--gold), var(--gold-bright), var(--cyan),
            var(--purple), var(--gold));
    animation: ring-spin 8s linear infinite;
    cursor: pointer;
    box-shadow: 0 0 34px rgba(255, 217, 122, 0.28);
    user-select: none;
}

.avatar-ring img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    border: 3px solid var(--bg-deep);
    pointer-events: none;
}

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

.avatar-ring > img {
    animation: ring-spin-rev 8s linear infinite;
}

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

.avatar-burst {
    position: absolute;
    inset: -30px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 217, 122, 0.85) 0%, rgba(255, 217, 122, 0) 65%);
    opacity: 0;
    pointer-events: none;
    transform: scale(0.5);
}

.avatar-burst.burst {
    animation: burst 0.8s ease-out;
}

@keyframes burst {
    0% { opacity: 0.95; transform: scale(0.5); }
    100% { opacity: 0; transform: scale(1.6); }
}

.hero-stars {
    color: var(--gold-bright);
    letter-spacing: 0.55em;
    font-size: 1rem;
    text-shadow: 0 0 12px rgba(255, 217, 122, 0.65);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 5.5vw, 3.4rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    word-break: keep-all;
    background: linear-gradient(120deg, var(--gold-bright) 20%, var(--gold) 50%, #fff2cf 80%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px rgba(255, 217, 122, 0.18);
}

.hero-sub {
    font-size: clamp(1rem, 2.4vw, 1.3rem);
    color: var(--cyan);
    letter-spacing: 0.35em;
    text-transform: uppercase;
    text-shadow: 0 0 16px rgba(126, 232, 250, 0.45);
}

.hero-tags {
    display: flex;
    gap: 0.7rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 0.4rem;
}

.tag {
    font-size: 0.85rem;
    letter-spacing: 0.12em;
    color: var(--gold);
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    padding: 0.2rem 1rem;
    background: rgba(211, 188, 142, 0.08);
    transition: transform 0.25s, box-shadow 0.25s;
}

.tag:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 18px rgba(255, 217, 122, 0.25);
}

.hero-scroll {
    margin-top: 2.2rem;
    color: var(--ink-dim);
    text-decoration: none;
    font-size: 1.1rem;
}

.hero-scroll-arrow {
    display: inline-block;
    animation: bob 1.8s ease-in-out infinite;
}

@keyframes bob {
    0%, 100% { transform: translateY(0); opacity: 0.6; }
    50% { transform: translateY(8px); opacity: 1; }
}

/* ---------- Panels ---------- */

.main {
    max-width: 980px;
    margin: 0 auto;
    padding: 1rem 1.5rem 4rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.panel {
    scroll-margin-top: 86px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    padding: 2.2rem 2.4rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35), inset 0 0 60px rgba(211, 188, 142, 0.04);
    position: relative;
}

.panel::before {
    content: "✦";
    position: absolute;
    top: -11px;
    left: 28px;
    color: var(--gold-bright);
    background: var(--bg-deep);
    padding: 0 8px;
    font-size: 0.9rem;
}

.panel-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gold);
    letter-spacing: 0.06em;
    padding-bottom: 0.8rem;
    margin-bottom: 1.2rem;
    border-bottom: 1px solid rgba(211, 188, 142, 0.25);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.panel-icon {
    filter: drop-shadow(0 0 6px rgba(255, 217, 122, 0.5));
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

/* ---------- Markdown content typography ---------- */

.panel-body h2,
.panel-body h3 {
    font-family: var(--font-display);
    color: var(--gold-bright);
    font-size: 1.15rem;
    margin: 1.6rem 0 0.6rem;
    letter-spacing: 0.04em;
}

.panel-body h2:first-child,
.panel-body h3:first-child {
    margin-top: 0.2rem;
}

.panel-body h4 {
    color: var(--cyan);
    font-size: 1.02rem;
    margin: 1.2rem 0 0.4rem;
}

.panel-body p {
    margin: 0.6rem 0;
}

.panel-body a {
    color: var(--cyan);
    text-decoration: none;
    border-bottom: 1px dashed rgba(126, 232, 250, 0.4);
    transition: color 0.2s, border-color 0.2s;
}

.panel-body a:hover {
    color: #b7f3ff;
    border-bottom-style: solid;
}

.panel-body ul, .panel-body ol {
    padding-left: 1.4rem;
    margin: 0.5rem 0;
}

.panel-body li {
    margin: 0.3rem 0;
}

.panel-body li::marker {
    color: var(--gold);
}

.panel-body strong {
    color: #fff2cf;
}

.panel-body em {
    color: var(--ink-dim);
}

.panel-body hr {
    border: none;
    height: 1px;
    margin: 1.6rem 0;
    background: linear-gradient(90deg, transparent, rgba(211, 188, 142, 0.5), transparent);
}

.panel-body img {
    vertical-align: middle;
}

.panel-body blockquote {
    border-left: 3px solid var(--gold);
    padding: 0.3rem 1rem;
    margin: 0.8rem 0;
    color: var(--ink-dim);
    background: rgba(211, 188, 142, 0.06);
    border-radius: 0 8px 8px 0;
}

.panel-body code {
    font-size: 0.88em;
    background: rgba(126, 232, 250, 0.1);
    border: 1px solid rgba(126, 232, 250, 0.25);
    border-radius: 4px;
    padding: 0.1em 0.4em;
    color: var(--cyan);
}

/* ---------- Footer ---------- */

.footer {
    text-align: center;
    padding: 2.5rem 1.5rem 3rem;
    color: var(--ink-dim);
    border-top: 1px solid rgba(211, 188, 142, 0.18);
    font-size: 0.9rem;
}

.footer-copy {
    margin-bottom: 0.4rem;
}

.footer-links a {
    color: var(--gold);
    text-decoration: none;
}

.footer-links a:hover {
    text-shadow: 0 0 10px rgba(255, 217, 122, 0.6);
}

.footer-rune {
    margin-top: 1rem;
    color: rgba(211, 188, 142, 0.35);
    cursor: pointer;
    transition: color 0.3s, transform 0.3s;
    display: inline-block;
}

.footer-rune:hover {
    color: var(--gold-bright);
    transform: rotate(180deg);
}

/* ============================================================
   Easter eggs
   ============================================================ */

/* ---------- Floating companion ---------- */

#companion {
    position: fixed;
    left: 0;
    top: 0;
    width: 54px;
    height: 54px;
    z-index: 90;
    cursor: pointer;
    transition: transform 2.4s ease-in-out;
    will-change: transform;
}

.companion-body {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 50% 50% 50% 12%;
    background: radial-gradient(circle at 35% 30%, #d9fbff 0%, var(--cyan) 45%, #3aa7c9 100%);
    box-shadow: 0 0 22px rgba(126, 232, 250, 0.75), 0 0 60px rgba(126, 232, 250, 0.3);
    animation: companion-float 2.6s ease-in-out infinite;
}

@keyframes companion-float {
    0%, 100% { transform: translateY(0) rotate(-4deg); }
    50% { transform: translateY(-9px) rotate(4deg); }
}

.companion-eye {
    position: absolute;
    top: 42%;
    width: 6px;
    height: 8px;
    border-radius: 50%;
    background: #16324a;
    animation: blink 4.2s infinite;
}

.companion-eye.left { left: 30%; }
.companion-eye.right { right: 30%; }

@keyframes blink {
    0%, 92%, 100% { transform: scaleY(1); }
    95% { transform: scaleY(0.1); }
}

.companion-bubble {
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%) scale(0.6);
    min-width: 150px;
    max-width: 220px;
    background: rgba(255, 250, 235, 0.97);
    color: #4a3f28;
    font-size: 0.85rem;
    line-height: 1.5;
    padding: 0.5rem 0.8rem;
    border-radius: 12px;
    border: 1px solid var(--gold);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    text-align: center;
}

.companion-bubble::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 7px solid transparent;
    border-top-color: var(--gold);
}

.companion-bubble.show {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

/* ---------- Primogem counter ---------- */

.primogem-counter {
    position: fixed;
    left: 18px;
    bottom: 18px;
    z-index: 95;
    background: rgba(11, 16, 38, 0.85);
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    padding: 0.35rem 1rem;
    color: var(--gold-bright);
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    box-shadow: 0 0 18px rgba(255, 217, 122, 0.2);
    transition: opacity 0.5s, transform 0.5s;
}

.primogem-counter.hidden {
    opacity: 0;
    transform: translateY(16px);
    pointer-events: none;
}

.primogem-counter.pop {
    animation: pop 0.35s ease-out;
}

@keyframes pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.25); }
    100% { transform: scale(1); }
}

/* ---------- Wish (gacha) overlay ---------- */

.wish-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: radial-gradient(ellipse at center, rgba(30, 38, 80, 0.96) 0%, rgba(5, 8, 22, 0.99) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    cursor: pointer;
    transition: opacity 0.5s;
}

.wish-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.wish-beam {
    position: absolute;
    left: 50%;
    top: -10%;
    width: 120px;
    height: 120%;
    transform: translateX(-50%) rotate(8deg);
    background: linear-gradient(180deg,
            rgba(255, 217, 122, 0) 0%,
            rgba(255, 217, 122, 0.75) 40%,
            rgba(255, 242, 207, 0.95) 55%,
            rgba(255, 217, 122, 0.75) 70%,
            rgba(255, 217, 122, 0) 100%);
    filter: blur(14px);
    animation: beam-fall 1.1s ease-out;
}

@keyframes beam-fall {
    0% { transform: translateX(-50%) translateY(-100%) rotate(8deg); opacity: 0; }
    60% { opacity: 1; }
    100% { transform: translateX(-50%) translateY(0) rotate(8deg); opacity: 1; }
}

.wish-card {
    position: relative;
    width: 240px;
    height: 340px;
    perspective: 1200px;
    z-index: 1;
}

.wish-card-inner {
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    animation: card-in 1.6s ease-out forwards;
}

@keyframes card-in {
    0% { transform: translateY(60px) rotateY(0deg) scale(0.6); opacity: 0; }
    50% { transform: translateY(0) rotateY(720deg) scale(1.05); opacity: 1; }
    100% { transform: translateY(0) rotateY(900deg) scale(1); opacity: 1; }
}

.wish-card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 14px;
    border: 2px solid var(--gold-bright);
    box-shadow: 0 0 40px rgba(255, 217, 122, 0.45), inset 0 0 40px rgba(255, 217, 122, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.wish-card-back {
    background: linear-gradient(160deg, #2a3270 0%, #141a3d 100%);
    color: var(--gold-bright);
    font-size: 3rem;
}

/* After the spin, JS adds .flipped: drop the 3D transforms so the
   front face renders even where backface-visibility is flaky. */
.wish-card-inner.flipped {
    animation: none;
    transform: none;
}

.wish-card-inner.flipped .wish-card-back {
    display: none;
}

.wish-card-inner.flipped .wish-card-front {
    transform: none;
}

.wish-card-front {
    background: linear-gradient(160deg, #fdf6e3 0%, #efe0b8 100%);
    color: #5a4a26;
    transform: rotateY(180deg);
    padding: 1rem;
    text-align: center;
}

.wish-card-front img {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--gold);
    box-shadow: 0 0 18px rgba(211, 188, 142, 0.8);
}

.wish-card-rarity {
    color: #e8a93d;
    letter-spacing: 0.2em;
    font-size: 1.05rem;
    text-shadow: 0 0 8px rgba(255, 217, 122, 0.8);
}

.wish-card-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
}

.wish-card-title {
    font-size: 0.9rem;
    color: #8a7440;
}

.wish-card-constellation {
    font-size: 0.8rem;
    color: #a08b52;
    border-top: 1px solid rgba(160, 139, 82, 0.4);
    padding-top: 0.4rem;
    width: 80%;
}

.wish-hint {
    position: absolute;
    bottom: 6%;
    color: var(--ink-dim);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    animation: bob 2s ease-in-out infinite;
}

/* ---------- Level up overlay ---------- */

.levelup-overlay {
    position: fixed;
    inset: 0;
    z-index: 190;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    background: radial-gradient(circle, rgba(255, 217, 122, 0.35) 0%, rgba(255, 217, 122, 0) 60%);
    opacity: 0;
    transition: opacity 0.3s;
}

.levelup-overlay.show {
    opacity: 1;
}

.levelup-text {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 7vw, 4.2rem);
    font-weight: 700;
    color: var(--gold-bright);
    text-shadow: 0 0 30px rgba(255, 217, 122, 0.9), 0 0 80px rgba(255, 217, 122, 0.5);
    transform: scale(0.6);
}

.levelup-overlay.show .levelup-text {
    animation: levelup-pop 1.4s ease-out forwards;
}

@keyframes levelup-pop {
    0% { transform: scale(0.6); opacity: 0; }
    30% { transform: scale(1.15); opacity: 1; }
    55% { transform: scale(1); }
    100% { transform: scale(1.05); opacity: 1; }
}

/* ---------- Achievement toasts ---------- */

.toast-container {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 210;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    pointer-events: none;
}

.toast {
    background: rgba(11, 16, 38, 0.92);
    border: 1px solid var(--gold);
    border-left: 4px solid var(--gold-bright);
    border-radius: 10px;
    padding: 0.7rem 1.1rem;
    min-width: 240px;
    color: var(--ink);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5), 0 0 18px rgba(255, 217, 122, 0.15);
    transform: translateX(120%);
    transition: transform 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2), opacity 0.45s;
}

.toast.show {
    transform: translateX(0);
}

.toast.hide {
    opacity: 0;
    transform: translateX(120%);
}

.toast-title {
    color: var(--gold-bright);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    margin-bottom: 0.15rem;
}

.toast-body {
    font-size: 0.95rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
    .nav {
        padding: 0.6rem 1.1rem;
    }

    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: rgba(11, 16, 38, 0.96);
        border-bottom: 1px solid var(--panel-border);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }

    .nav-links.open {
        max-height: 320px;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links li a {
        display: block;
        padding: 0.8rem 1.4rem;
    }

    .panel {
        padding: 1.5rem 1.3rem;
    }

    .avatar-ring {
        width: 132px;
        height: 132px;
    }

    .toast-container {
        left: 18px;
        right: 18px;
    }

    .toast {
        min-width: 0;
    }
}