:root {
    --bg: #f8f4ff;
    --text: #2a2138;
    --muted: #6e6485;
    --surface: rgba(255,255,255,0.72);
    --surface-strong: rgba(255,255,255,0.86);
    --border: rgba(83, 61, 120, 0.12);
    --header-bg: rgba(248, 244, 255, 0.86);
    --alt-bg: rgba(129, 101, 177, 0.06);
    --glow-1: rgba(181, 126, 255, 0.24);
    --glow-2: rgba(255, 107, 152, 0.18);
    --pill-bg: rgba(181,126,255,0.16);
    --pill-text: #6d3fb0;
    --shadow: 0 18px 60px rgba(76, 42, 130, 0.10);
    --btn-secondary-bg: rgba(255,255,255,0.66);
    --btn-secondary-border: rgba(83, 61, 120, 0.16);
    --input-bg: rgba(255,255,255,0.82);
    --input-text: #2a2138;
    --input-placeholder: #867ca0;
}

.theme-night {
    --bg: #0f0b1d;
    --text: #f5f1ff;
    --muted: #d9d0eb;
    --surface: rgba(255,255,255,0.04);
    --surface-strong: rgba(255,255,255,0.08);
    --border: rgba(255,255,255,0.10);
    --header-bg: rgba(15, 11, 29, 0.90);
    --alt-bg: rgba(255,255,255,0.03);
    --glow-1: rgba(181, 126, 255, 0.22);
    --glow-2: rgba(255, 107, 152, 0.18);
    --pill-bg: rgba(181,126,255,0.20);
    --pill-text: #edd8ff;
    --shadow: 0 18px 60px rgba(0,0,0,0.25);
    --btn-secondary-bg: rgba(255,255,255,0.04);
    --btn-secondary-border: rgba(255,255,255,0.18);
    --input-bg: rgba(255,255,255,0.05);
    --input-text: #ffffff;
    --input-placeholder: #bfb6d5;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.35s ease, color 0.35s ease;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1120px, calc(100% - 2rem));
    margin: 0 auto;
}

.narrow {
    width: min(760px, calc(100% - 2rem));
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.brand {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.nav {
    display: flex;
    gap: 1.25rem;
    font-size: 0.95rem;
}

.hero {
    padding: 5rem 0 4rem;
    background:
        radial-gradient(circle at top right, var(--glow-1), transparent 30%),
        radial-gradient(circle at top left, var(--glow-2), transparent 32%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2rem;
    align-items: center;
}

.eyebrow {
    margin: 0 0 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.78rem;
    color: #b57eff;
}

.hero h1 {
    margin: 0 0 1rem;
    font-size: clamp(2.2rem, 5vw, 4.4rem);
    line-height: 1.05;
}

.hero-text {
    max-width: 640px;
    font-size: 1.08rem;
    color: var(--muted);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0.8rem 1.2rem;
    border-radius: 999px;
    font-weight: 700;
    transition: transform 0.18s ease, opacity 0.18s ease, background 0.25s ease, color 0.25s ease;
}

.btn:hover {
    transform: translateY(-1px);
    opacity: 0.96;
}

.btn-primary {
    background: linear-gradient(135deg, #b57eff, #ff6b98);
    color: #ffffff;
}

.btn-secondary {
    border: 1px solid var(--btn-secondary-border);
    color: var(--text);
    background: var(--btn-secondary-bg);
}

.hero-card {
    position: relative;
    display: flex;
    justify-content: center;
}

.card-glow {
    position: absolute;
    inset: auto;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(181, 126, 255, 0.36), transparent 65%);
    filter: blur(28px);
}

.mock-card {
    position: relative;
    width: 100%;
    max-width: 360px;
    padding: 1.5rem;
    border-radius: 24px;
    background: linear-gradient(180deg, var(--surface-strong), var(--surface));
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.mock-badge {
    display: inline-block;
    margin-bottom: 1rem;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    background: rgba(255, 107, 152, 0.14);
    color: #d4527d;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.theme-night .mock-badge {
    color: #ffd4e1;
    background: rgba(255, 107, 152, 0.18);
}

.mock-card h2 {
    margin: 0 0 0.75rem;
    font-size: 1.4rem;
}

.mock-card p {
    margin: 0;
    color: var(--muted);
}

.section {
    padding: 4rem 0;
}

.alt-section {
    background: var(--alt-bg);
}

.section h2 {
    margin-top: 0;
    font-size: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.feature-card {
    padding: 1.4rem;
    border-radius: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.feature-card h3 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.join-form {
    display: grid;
    gap: 0.85rem;
    margin-top: 1.5rem;
}

.join-form label {
    font-weight: 700;
}

.join-form input {
    width: 100%;
    min-height: 48px;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: var(--input-bg);
    color: var(--input-text);
}

.join-form input::placeholder {
    color: var(--input-placeholder);
}

.site-footer {
    padding: 2rem 0 3rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.join-success {
    padding: 3rem 0 0;
}

.success-card {
    padding: 2rem;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(181,126,255,0.12), rgba(255,107,152,0.12));
    border: 1px solid var(--border);
    text-align: center;
    box-shadow: var(--shadow);
}

.success-card h2 {
    margin-top: 0;
    font-size: 1.8rem;
}

.success-card p {
    color: var(--muted);
}

.app-body {
    background: var(--bg);
    color: var(--text);
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.app-header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.app-user-meta {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.app-user-name {
    font-weight: 700;
}

.premium-pill {
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    background: var(--pill-bg);
    color: var(--pill-text);
    font-size: 0.8rem;
    font-weight: 700;
}

.app-logout {
    padding: 0.45rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--btn-secondary-border);
    font-size: 0.9rem;
    background: var(--btn-secondary-bg);
}

.app-main {
    padding: 2rem 0 4rem;
}

.app-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 1.5rem;
}

.app-sidebar {
    position: sticky;
    top: 84px;
    align-self: start;
}

.app-nav {
    display: grid;
    gap: 0.75rem;
}

.app-nav-item {
    display: block;
    padding: 0.9rem 1rem;
    border-radius: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
}

.app-nav-item.active {
    background: linear-gradient(135deg, rgba(181,126,255,0.18), rgba(255,107,152,0.16));
    border-color: rgba(181,126,255,0.22);
}

.app-content {
    display: grid;
    gap: 1.25rem;
}

.app-hero-card {
    padding: 1.6rem;
    border-radius: 24px;
    background: linear-gradient(180deg, var(--surface-strong), var(--surface));
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.app-hero-card h1 {
    margin: 0.2rem 0 0.8rem;
    font-size: clamp(2rem, 4vw, 3rem);
}

.app-subtext {
    color: var(--muted);
    margin: 0.5rem 0;
}

.app-card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.app-card {
    padding: 1.25rem;
    border-radius: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.app-card h2 {
    margin-top: 0;
    font-size: 1.1rem;
}

.app-inline-btn {
    min-height: 40px;
    padding: 0.7rem 1rem;
    font-size: 0.95rem;
}

@media (max-width: 980px) {
    .app-layout {
        grid-template-columns: 1fr;
    }

    .app-sidebar {
        position: static;
    }

    .app-card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .hero-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .nav {
        display: none;
    }

    .hero {
        padding-top: 4rem;
    }
}

.theme-morning {
    --bg: #fff8f2;
    --text: #3a2d2a;
    --muted: #7f6a63;
    --surface: rgba(255,255,255,0.78);
    --surface-strong: rgba(255,255,255,0.92);
    --border: rgba(180, 132, 110, 0.14);
    --header-bg: rgba(255, 248, 242, 0.88);
    --alt-bg: rgba(255, 199, 153, 0.10);
    --glow-1: rgba(255, 191, 120, 0.28);
    --glow-2: rgba(255, 145, 169, 0.20);
    --pill-bg: rgba(255,191,120,0.18);
    --pill-text: #a85d2a;
    --shadow: 0 18px 60px rgba(176, 115, 72, 0.10);
    --btn-secondary-bg: rgba(255,255,255,0.72);
    --btn-secondary-border: rgba(180, 132, 110, 0.18);
    --input-bg: rgba(255,255,255,0.88);
    --input-text: #3a2d2a;
    --input-placeholder: #9b857d;
}

.theme-day {
    --bg: #f8f4ff;
    --text: #2a2138;
    --muted: #6e6485;
    --surface: rgba(255,255,255,0.72);
    --surface-strong: rgba(255,255,255,0.86);
    --border: rgba(83, 61, 120, 0.12);
    --header-bg: rgba(248, 244, 255, 0.86);
    --alt-bg: rgba(129, 101, 177, 0.06);
    --glow-1: rgba(181, 126, 255, 0.24);
    --glow-2: rgba(255, 107, 152, 0.18);
    --pill-bg: rgba(181,126,255,0.16);
    --pill-text: #6d3fb0;
    --shadow: 0 18px 60px rgba(76, 42, 130, 0.10);
    --btn-secondary-bg: rgba(255,255,255,0.66);
    --btn-secondary-border: rgba(83, 61, 120, 0.16);
    --input-bg: rgba(255,255,255,0.82);
    --input-text: #2a2138;
    --input-placeholder: #867ca0;
}

.theme-sunset {
    --bg: #fff2ec;
    --text: #3b2331;
    --muted: #81606f;
    --surface: rgba(255,255,255,0.70);
    --surface-strong: rgba(255,255,255,0.84);
    --border: rgba(164, 94, 120, 0.14);
    --header-bg: rgba(255, 242, 236, 0.90);
    --alt-bg: rgba(255, 162, 125, 0.10);
    --glow-1: rgba(255, 140, 102, 0.24);
    --glow-2: rgba(214, 110, 172, 0.20);
    --pill-bg: rgba(255,140,102,0.16);
    --pill-text: #b34b5d;
    --shadow: 0 18px 60px rgba(157, 83, 93, 0.12);
    --btn-secondary-bg: rgba(255,255,255,0.70);
    --btn-secondary-border: rgba(164, 94, 120, 0.16);
    --input-bg: rgba(255,255,255,0.86);
    --input-text: #3b2331;
    --input-placeholder: #9a7484;
}

.theme-morning .eyebrow { color: #c67d3b; }
.theme-sunset .eyebrow { color: #c2557e; }
.theme-morning .mock-badge { color: #b8585d; background: rgba(255, 145, 169, 0.16); }
.theme-sunset .mock-badge { color: #b8426d; background: rgba(214, 110, 172, 0.16); }

.theme-night body,
.theme-night .app-body {
    position: relative;
}

.theme-night body::before,
.theme-night .app-body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(255,255,255,0.85) 0 1px, transparent 1.6px),
        radial-gradient(circle at 22% 72%, rgba(255,255,255,0.55) 0 1px, transparent 1.8px),
        radial-gradient(circle at 36% 34%, rgba(255,255,255,0.75) 0 1px, transparent 1.7px),
        radial-gradient(circle at 48% 82%, rgba(255,255,255,0.45) 0 1px, transparent 1.8px),
        radial-gradient(circle at 58% 18%, rgba(255,255,255,0.80) 0 1px, transparent 1.7px),
        radial-gradient(circle at 66% 58%, rgba(255,255,255,0.50) 0 1px, transparent 1.8px),
        radial-gradient(circle at 78% 28%, rgba(255,255,255,0.72) 0 1px, transparent 1.7px),
        radial-gradient(circle at 86% 74%, rgba(255,255,255,0.58) 0 1px, transparent 1.8px),
        radial-gradient(circle at 92% 14%, rgba(255,255,255,0.84) 0 1px, transparent 1.7px);
    opacity: 0.32;
    animation: starTwinkle 7s ease-in-out infinite alternate;
}

.theme-night body::after,
.theme-night .app-body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        radial-gradient(circle at 14% 60%, rgba(181,126,255,0.18) 0 2px, transparent 3px),
        radial-gradient(circle at 74% 12%, rgba(255,107,152,0.14) 0 2px, transparent 3px),
        radial-gradient(circle at 84% 44%, rgba(181,126,255,0.14) 0 2px, transparent 3px);
    opacity: 0.28;
    animation: starTwinkleSlow 11s ease-in-out infinite alternate;
}

.theme-night .site-header,
.theme-night .hero,
.theme-night .section,
.theme-night .site-footer,
.theme-night .app-header,
.theme-night .app-main {
    position: relative;
    z-index: 1;
}

@keyframes starTwinkle {
    0% { opacity: 0.18; transform: translateY(0px); }
    50% { opacity: 0.34; }
    100% { opacity: 0.26; transform: translateY(-2px); }
}

@keyframes starTwinkleSlow {
    0% { opacity: 0.16; }
    50% { opacity: 0.30; }
    100% { opacity: 0.20; }
}