/* ========================
   App Terms - Premium Human-Built UI
   ======================== */

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --accent: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);

    --bg-color: #fafbfc;
    --bg-card: #ffffff;
    --bg-subtle: #f3f4f6;

    --text-primary: #111827;
    --text-secondary: #374151;
    --text-muted: #6b7280;
    --text-light: #9ca3af;

    --border-color: rgba(0, 0, 0, 0.06);
    --border-hover: rgba(99, 102, 241, 0.3);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --max-width: 880px;
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    width: 100%;
    min-height: 100vh;
    background-color: var(--bg-color);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-secondary);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ========================
   Background Decorations
   ======================== */
body::before {
    content: "";
    position: fixed;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    animation: float 20s ease-in-out infinite;
}

body::after {
    content: "";
    position: fixed;
    bottom: -30%;
    left: -15%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(30px, -30px) scale(1.05);
    }

    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }

    75% {
        transform: translate(20px, 10px) scale(1.02);
    }
}

/* ========================
   Header
   ======================== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 0.875rem 0;
    transition: var(--transition-smooth);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
    transition: var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

/* ========================
   Main Container
   ======================== */
.main-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 2rem 5rem;
}

/* ========================
   Hero Section
   ======================== */
.hero {
    text-align: center;
    padding: 3rem 0 4rem;
    margin-bottom: 1rem;
    position: relative;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    color: var(--primary);
    padding: 0.5rem 1.25rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1.75rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
    animation: fadeInDown 0.6s ease-out;
}

.hero-badge svg {
    color: var(--primary);
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    letter-spacing: -0.03em;
    line-height: 1.15;
    background: linear-gradient(135deg, var(--text-primary) 0%, #374151 100%);
    -webkit-background-clip: text;
    background-clip: text;
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

/* ========================
   Table of Contents
   ======================== */
.toc {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-sm);
    animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

.toc-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toc-title::before {
    content: "";
    display: block;
    width: 16px;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: 1px;
}

.toc-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.75rem 1.5rem;
    list-style: none;
}

.toc-item {
    font-size: 0.9rem;
    line-height: 1.6;
}

.toc-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.toc-link:hover {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.06);
}

.toc-number {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-light);
    min-width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-subtle);
    border-radius: 6px;
    transition: var(--transition-fast);
}

.toc-link:hover .toc-number {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

/* ========================
   Content Sections
   ======================== */
.terms-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.section {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    box-shadow: var(--shadow-xs);
    transition: var(--transition-smooth);
    animation: fadeInUp 0.5s ease-out backwards;
}

.section:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Staggered animation delays */
.section:nth-child(1) {
    animation-delay: 0.1s;
}

.section:nth-child(2) {
    animation-delay: 0.15s;
}

.section:nth-child(3) {
    animation-delay: 0.2s;
}

.section:nth-child(4) {
    animation-delay: 0.25s;
}

.section:nth-child(5) {
    animation-delay: 0.3s;
}

.section:nth-child(6) {
    animation-delay: 0.35s;
}

.section:nth-child(7) {
    animation-delay: 0.4s;
}

.section:nth-child(8) {
    animation-delay: 0.45s;
}

.section:nth-child(9) {
    animation-delay: 0.5s;
}

.section:nth-child(10) {
    animation-delay: 0.55s;
}

/* Section Header */
.section-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    position: relative;
}

.section-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.12));
    border-radius: var(--radius-md);
    border: 1px solid rgba(99, 102, 241, 0.15);
    flex-shrink: 0;
    transition: var(--transition-smooth);
}

.section:hover .section-icon {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.18));
    border-color: rgba(99, 102, 241, 0.25);
    transform: scale(1.05);
}

.section-icon svg {
    width: 22px;
    height: 22px;
    color: var(--primary);
}

.section-title {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.35;
    flex: 1;
    padding-top: 0.35rem;
}

/* Notice Badge */
.notice-badge {
    position: absolute;
    top: 0;
    right: 0;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.15));
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* Section Body */
.section-body {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.section-body p {
    margin-bottom: 1.25rem;
}

.section-body p:last-child {
    margin-bottom: 0;
}

.section-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Lists */
.section-body ul {
    margin: 1.25rem 0;
    padding: 0;
    list-style: none;
}

.section-body li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 0.875rem;
}

.section-body li:last-child {
    margin-bottom: 0;
}

.section-body li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.65rem;
    width: 8px;
    height: 8px;
    background: var(--accent-gradient);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.3);
}

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.04), rgba(139, 92, 246, 0.06));
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    margin: 1.5rem 0;
    position: relative;
    overflow: hidden;
}

.highlight-box::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-gradient);
}

.highlight-box h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.875rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.highlight-box h4::before {
    content: "✦";
    font-size: 0.9rem;
    color: var(--primary);
}

.highlight-box p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* ========================
   Special Notice Sections
   ======================== */
.section.notice-section {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border-left: none;
}

.section.notice-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary) 0%, var(--accent) 100%);
}

/* Updated Date */
.last-updated {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 2rem;
}

.last-updated strong {
    color: var(--text-secondary);
}

/* ========================
   Animations
   ======================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-16px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================
   Responsive Design
   ======================== */
@media (max-width: 768px) {
    .main-container {
        padding: 2rem 1.25rem 4rem;
    }

    .hero {
        padding: 2rem 0 3rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .toc {
        padding: 1.5rem;
    }

    .toc-list {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 1.75rem;
    }

    .section-header {
        flex-direction: column;
        gap: 1rem;
    }

    .notice-badge {
        position: static;
        align-self: flex-start;
        margin-top: -0.5rem;
        margin-bottom: 0.5rem;
        order: -1;
    }

    .section-title {
        font-size: 1.2rem;
        padding-top: 0;
    }

    .section-icon {
        width: 42px;
        height: 42px;
    }

    .nav {
        display: none;
    }

    body::before,
    body::after {
        display: none;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 1rem;
    }

    .main-container {
        padding: 1.5rem 1rem 3rem;
    }

    .section {
        padding: 1.5rem;
        border-radius: var(--radius-md);
    }

    .highlight-box {
        padding: 1.25rem;
    }

    .hero-badge {
        font-size: 0.7rem;
        padding: 0.4rem 1rem;
    }
}

/* ========================
   Print Styles
   ======================== */
@media print {

    body::before,
    body::after,
    .header {
        display: none;
    }

    .section {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}