:root {
    /* Primary Colors */
    --color-primary-light: #C7D2FE;
    --color-primary-main: #4F46E5;
    --color-primary-dark: #3730A3;
    
    /* Accent Colors */
    --color-accent-light: #FECACA;
    --color-accent-main: #F87171;
    --color-accent-dark: #DC2626;
    
    /* Gray Scale */
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Semantic Colors */
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    --color-info: #3B82F6;
    
    /* Typography */
    --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    line-height: 1.7;
    min-height: 100vh;
}

/* Page Container */
.terms-page {
    min-height: 100vh;
    position: relative;
}

/* Background Effects */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(79, 70, 229, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(248, 113, 113, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 80%);
    pointer-events: none;
    z-index: 0;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(17, 24, 39, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-gray-800);
}

.header-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.back-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-gray-700);
    border-radius: 10px;
    color: var(--color-gray-300);
    cursor: pointer;
    transition: all 0.2s ease;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-gray-600);
    color: #FFFFFF;
}

.back-button svg {
    width: 20px;
    height: 20px;
}

.header-title {
    font-size: 17px;
    font-weight: 600;
    color: #FFFFFF;
}

.header-spacer {
    width: 40px;
}

/* Main Container */
.main-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px 60px;
    position: relative;
    z-index: 1;
}

/* Logo Section */
.logo-section {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    margin-bottom: 12px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--color-accent-main) 0%, var(--color-accent-dark) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(248, 113, 113, 0.25);
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-text {
    font-size: 24px;
    font-weight: 800;
    color: #FFFFFF;
    letter-spacing: -0.02em;
}

.logo-text .accent {
    color: var(--color-accent-main);
}

.tagline {
    font-size: 14px;
    color: var(--color-gray-500);
}

/* Title Section */
.title-section {
    text-align: center;
    margin-bottom: 40px;
}

.page-title {
    font-size: 32px;
    font-weight: 900;
    color: #FFFFFF;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.effective-date {
    font-size: 14px;
    color: var(--color-gray-500);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 20px;
}

/* Content Card */
.content-card {
    background: linear-gradient(160deg, var(--color-gray-800) 0%, rgba(31, 41, 55, 0.6) 100%);
    border: 1px solid var(--color-gray-700);
    border-radius: 20px;
    padding: 40px;
    backdrop-filter: blur(10px);
}

/* Table of Contents */
.toc {
    background: var(--color-gray-900);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 40px;
}

.toc-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.toc-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px 24px;
    counter-reset: toc-counter;
}

.toc-list li {
    counter-increment: toc-counter;
}

.toc-list a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    color: var(--color-gray-400);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.toc-list a::before {
    content: counter(toc-counter) ".";
    color: var(--color-primary-main);
    font-weight: 600;
    min-width: 24px;
}

.toc-list a:hover {
    color: #FFFFFF;
}

/* Section Styles */
.section {
    margin-bottom: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--color-gray-700);
}

.section:last-of-type {
    margin-bottom: 32px;
    padding-bottom: 32px;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 20px;
}

.section-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary-main) 0%, var(--color-primary-dark) 100%);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 700;
    color: #FFFFFF;
}

.subsection-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-gray-200);
    margin: 28px 0 12px;
    padding-left: 12px;
    border-left: 3px solid var(--color-accent-main);
}

.section p {
    margin-bottom: 16px;
    color: var(--color-gray-300);
}

/* Styled Lists */
.styled-list {
    list-style: none;
    margin: 16px 0;
}

.styled-list > li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--color-gray-300);
}

.styled-list > li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-accent-main);
    border-radius: 50%;
}

.styled-list.warning > li::before {
    background: var(--color-warning);
}

/* Definition List */
.definition-list {
    margin: 20px 0;
}

.definition-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px;
    background: var(--color-gray-900);
    margin-bottom: 10px;
    border-left: 3px solid var(--color-primary-main);
}

.definition-term {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary-light);
}

.definition-desc {
    font-size: 14px;
    color: var(--color-gray-400);
    line-height: 1.6;
}

/* Service Grid */
.service-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin: 24px 0;
}

.service-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--color-gray-900);
    border-radius: 12px;
    border: 1px solid var(--color-gray-700);
}

.service-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary-main) 0%, var(--color-primary-dark) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.service-icon svg {
    width: 20px;
    height: 20px;
    color: #FFFFFF;
}

.service-item span {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-200);
}

/* Prohibition List */
.prohibition-list {
    margin: 20px 0;
}

.prohibition-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 10px;
    margin-bottom: 8px;
}

.prohibition-item svg {
    width: 18px;
    height: 18px;
    color: var(--color-error);
    flex-shrink: 0;
    margin-top: 2px;
}

.prohibition-item span {
    font-size: 14px;
    color: var(--color-gray-300);
    line-height: 1.5;
}

/* Boxes */
.highlight-box {
    background: rgba(79, 70, 229, 0.1);
    border: 1px solid rgba(79, 70, 229, 0.3);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.highlight-box p {
    margin-bottom: 8px;
    color: var(--color-gray-200);
}

.highlight-box p:last-child {
    margin-bottom: 0;
}

.highlight-box strong {
    color: #FFFFFF;
}

.info-box {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 12px;
    padding: 16px 20px;
    margin: 20px 0;
}

.info-box > svg {
    width: 20px;
    height: 20px;
    color: var(--color-info);
    flex-shrink: 0;
    margin-top: 2px;
}

.info-box p {
    margin-bottom: 0;
    font-size: 14px;
    color: var(--color-gray-300);
}

.warning-box {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 12px;
    padding: 16px 20px;
    margin: 20px 0;
}

.warning-box > svg {
    width: 20px;
    height: 20px;
    color: var(--color-warning);
    flex-shrink: 0;
    margin-top: 2px;
}

.warning-box p {
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--color-gray-300);
}

.warning-box p:last-child {
    margin-bottom: 0;
}

.warning-box strong {
    color: var(--color-warning);
}

/* Link Button */
.link-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-gray-700);
    border-radius: 10px;
    color: var(--color-gray-300);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    margin-top: 16px;
    transition: all 0.2s;
}

.link-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-gray-600);
    color: #FFFFFF;
}

.link-button svg {
    width: 16px;
    height: 16px;
}

/* Effective Notice */
.effective-notice {
    text-align: center;
    padding: 20px;
    background: var(--color-gray-900);
    border-radius: 12px;
    margin-top: 32px;
}

.effective-notice span {
    font-size: 15px;
    color: var(--color-gray-400);
}

.effective-notice strong {
    color: var(--color-accent-main);
}

/* Footer */
.footer {
    text-align: center;
    padding: 32px 20px;
    margin-top: 40px;
    border-top: 1px solid var(--color-gray-800);
}

.footer p {
    font-size: 14px;
    color: var(--color-gray-500);
}

/* ========================================
   RESPONSIVE STYLES
   ======================================== */

@media (max-width: 768px) {
    .main-container {
        padding: 24px 16px 40px;
    }
    
    .content-card {
        padding: 24px 20px;
        border-radius: 16px;
    }
    
    .toc {
        padding: 20px;
    }
    
    .toc-list {
        grid-template-columns: 1fr;
        gap: 4px;
    }
    
    .page-title {
        font-size: 26px;
    }
    
    .section-title {
        font-size: 18px;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .definition-item {
        padding: 14px;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 12px 16px;
    }
    
    .header-title {
        font-size: 16px;
    }
    
    .main-container {
        padding: 20px 12px 32px;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
    }
    
    .logo-text {
        font-size: 22px;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .content-card {
        padding: 20px 16px;
        border-radius: 14px;
    }
    
    .toc {
        padding: 16px;
    }
    
    .toc-list a {
        font-size: 13px;
        padding: 6px 0;
    }
    
    .section {
        margin-bottom: 36px;
        padding-bottom: 36px;
    }
    
    .section-title {
        font-size: 17px;
        gap: 10px;
    }
    
    .section-number {
        width: 28px;
        height: 28px;
        font-size: 13px;
    }
    
    .service-item {
        padding: 14px;
    }
    
    .service-icon {
        width: 36px;
        height: 36px;
    }
    
    .prohibition-item {
        padding: 12px 14px;
    }
}

@media (max-width: 360px) {
    .content-card {
        padding: 16px 14px;
    }
    
    .section-title {
        font-size: 16px;
        flex-wrap: wrap;
    }
    
    .definition-item {
        padding: 12px;
    }
    
    .definition-term {
        font-size: 14px;
    }
    
    .definition-desc {
        font-size: 13px;
    }
}

/* Safe Area */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .footer {
        padding-bottom: calc(32px + env(safe-area-inset-bottom));
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    * {
        transition-duration: 0.01ms !important;
    }
}