:root {
    --bg: #07111f;
    --bg-soft: #0b1730;
    --panel: rgba(14, 23, 43, 0.82);
    --panel-strong: rgba(13, 22, 41, 0.95);
    --text: #edf3ff;
    --muted: #b6c2da;
    --line: rgba(132, 160, 212, 0.18);
    --primary: #4fd1c5;
    --primary-2: #7f9cf5;
    --danger: #ff7a7a;
    --success: #77f5a0;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
    --radius: 20px;
    --radius-sm: 14px;
    --container: 1180px;
    --transition: 0.25s ease;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(79, 209, 197, 0.08), transparent 30%),
        radial-gradient(circle at right center, rgba(127, 156, 245, 0.10), transparent 28%),
        linear-gradient(180deg, #07111f 0%, #091427 100%);
    color: var(--text);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button, input { font: inherit; }

.background-grid {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 34px 34px;
    mask-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.65), transparent 95%);
    pointer-events: none;
    z-index: 0;
}

.background-glow {
    position: fixed;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    filter: blur(70px);
    opacity: 0.18;
    pointer-events: none;
    z-index: 0;
}

.glow-1 { top: -120px; left: -100px; background: #3ad4c6; }
.glow-2 { right: -120px; top: 160px; background: #7188ff; }

.container {
    width: min(var(--container), calc(100% - 32px));
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(10px);
    background: rgba(7, 17, 31, 0.55);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    gap: 18px;
}

.brand { display: flex; align-items: center; gap: 14px; }

.brand-mark {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    font-weight: bold;
    color: #051019;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    box-shadow: var(--shadow);
}

.brand-title { font-size: 1.15rem; margin: 0 0 4px; }
.brand-subtitle { margin: 0; color: var(--muted); font-size: 0.95rem; }

.hero { padding: 54px 0 22px; }

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 30px;
    align-items: center;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(79, 209, 197, 0.10);
    border: 1px solid rgba(79, 209, 197, 0.24);
    color: #bff8f2;
    font-size: 0.9rem;
    margin-bottom: 18px;
}

.hero-text h2,
.section-heading h3,
.notice-box h3,
.menu-card h1 {
    margin: 0 0 18px;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero-text h2 {
    font-size: clamp(2rem, 4vw, 3.55rem);
    max-width: 780px;
}

.lead,
.section-heading p,
.content-card p,
.developer-card p,
.notice-box p,
.menu-subtitle {
    color: var(--muted);
    line-height: 1.75;
    font-size: 1rem;
}

.hero-highlights { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }

.info-chip {
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #dce7fb;
}

.hero-visual { display: flex; flex-direction: column; gap: 16px; }

.visual-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.visual-card.large { padding: 18px; }
.visual-card.small { padding: 18px; min-height: 122px; }

.visual-card.small p,
.visual-caption {
    color: var(--muted);
    line-height: 1.7;
}

.dev-illustration {
    width: 100%;
    height: auto;
    display: block;
}

.visual-caption { padding-top: 10px; }

.mini-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.section { padding: 34px 0 26px; position: relative; z-index: 1; }
.section-heading { max-width: 900px; margin-bottom: 22px; }

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.content-card {
    background: rgba(10, 19, 37, 0.78);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.content-card:hover {
    transform: translateY(-5px);
    border-color: rgba(79, 209, 197, 0.35);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

.content-card h4 { margin: 0 0 12px; font-size: 1.1rem; }
.section-contrast { padding-top: 44px; padding-bottom: 34px; }

.two-column {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 24px;
    align-items: start;
}

.feature-list {
    margin: 0;
    padding-left: 18px;
    color: var(--muted);
    line-height: 1.9;
}

.developer-panels { display: grid; gap: 16px; }

.developer-card {
    background: rgba(9, 18, 36, 0.84);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 16px;
    align-items: center;
    box-shadow: var(--shadow);
}

.developer-card h4 { margin: 0 0 8px; }

.developer-avatar {
    width: 72px;
    height: 72px;
    border-radius: 22px;
    position: relative;
    background:
        radial-gradient(circle at 50% 28%, #ffd6c1 0 11px, transparent 12px),
        radial-gradient(circle at 50% 58%, #4fd1c5 0 18px, transparent 19px),
        linear-gradient(180deg, #1b2748 0%, #0d1630 100%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    overflow: hidden;
}

.developer-avatar::after {
    content: "";
    position: absolute;
    inset: 8px;
    border-radius: 18px;
    border: 1px dashed rgba(127, 156, 245, 0.25);
}

.avatar-2 {
    background:
        radial-gradient(circle at 50% 28%, #ffd6c1 0 11px, transparent 12px),
        radial-gradient(circle at 50% 58%, #7f9cf5 0 18px, transparent 19px),
        linear-gradient(180deg, #1b2748 0%, #0d1630 100%);
}

.avatar-3 {
    background:
        radial-gradient(circle at 50% 28%, #ffd6c1 0 11px, transparent 12px),
        radial-gradient(circle at 50% 58%, #72e0a0 0 18px, transparent 19px),
        linear-gradient(180deg, #1b2748 0%, #0d1630 100%);
}

.final-note { padding-bottom: 60px; }

.notice-box,
.menu-card {
    background: var(--panel-strong);
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.btn {
    border: 0;
    border-radius: 14px;
    padding: 12px 18px;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition), background var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
    color: #06111b;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary), var(--primary-2));
    box-shadow: 0 14px 30px rgba(79, 209, 197, 0.22);
}

.btn-secondary {
    color: var(--text);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.10);
}

.btn-full { width: 100%; }

.modal.hidden { display: none; }

.modal {
    position: fixed;
    inset: 0;
    z-index: 50;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(4, 9, 18, 0.7);
    backdrop-filter: blur(8px);
}

.modal-panel {
    position: relative;
    z-index: 1;
    width: min(460px, calc(100% - 24px));
    margin: 10vh auto 0;
    background: var(--panel-strong);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    box-shadow: var(--shadow);
    animation: rise 0.25s ease;
}

@keyframes rise {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    border: 0;
    background: transparent;
    color: #dce7fb;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
}

.modal-header h3 { margin: 0 0 8px; font-size: 1.7rem; }

.modal-header p {
    margin: 0 0 18px;
    color: var(--muted);
    line-height: 1.7;
}

.login-form { display: grid; gap: 16px; }
.field { display: grid; gap: 8px; }

.field label { color: #dce7fb; font-weight: bold; }

.field input {
    width: 100%;
    padding: 13px 14px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.field input:focus {
    border-color: rgba(79, 209, 197, 0.48);
    box-shadow: 0 0 0 4px rgba(79, 209, 197, 0.10);
}

.login-message { min-height: 24px; color: var(--muted); font-size: 0.95rem; }
.login-message.success { color: var(--success); }
.login-message.error { color: var(--danger); }

.menu-page,
.menu-wrapper {
    min-height: 100vh;
}

.menu-wrapper {
    display: grid;
    place-items: center;
    padding: 24px;
    position: relative;
    z-index: 1;
}

.menu-card {
    width: min(760px, 100%);
    text-align: center;
}

.menu-buttons {
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 240px));
    justify-content: center;
    gap: 18px;
    margin-top: 28px;
}

.menu-button {
    padding: 18px 24px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(79, 209, 197, 0.16), rgba(127, 156, 245, 0.18));
    border: 1px solid rgba(127, 156, 245, 0.25);
    box-shadow: var(--shadow);
    font-weight: bold;
    font-size: 1.08rem;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.menu-button:hover {
    transform: translateY(-4px) scale(1.01);
    border-color: rgba(79, 209, 197, 0.48);
    box-shadow: 0 22px 44px rgba(0, 0, 0, 0.35);
}

.menu-actions { margin-top: 22px; }

.floating { animation: floating 5s ease-in-out infinite; }

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.pulse { animation: pulseCard 4s ease-in-out infinite; }
.delay { animation-delay: 0.7s; }
.delay-2 { animation-delay: 1.2s; }

@keyframes pulseCard {
    0%, 100% { box-shadow: var(--shadow); }
    50% { box-shadow: 0 18px 44px rgba(79, 209, 197, 0.15); }
}

@media (max-width: 980px) {
    .hero-grid,
    .two-column,
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .mini-panels { grid-template-columns: 1fr; }
    .menu-buttons { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .header-content {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero { padding-top: 34px; }
    .hero-text h2 { font-size: 2rem; }

    .notice-box,
    .menu-card,
    .content-card,
    .modal-panel {
        padding: 20px;
    }
}