:root{--bg-primary: #06080d;--bg-secondary: #0c1017;--bg-tertiary: #131923;--bg-surface: rgba(18, 24, 35, .7);--bg-surface-elevated: rgba(26, 35, 52, .85);--bg-glass: rgba(15, 21, 32, .65);--bg-glass-hover: rgba(22, 31, 48, .8);--accent-cyan: #00d2ff;--accent-cyan-glow: rgba(0, 210, 255, .35);--accent-cyan-subtle: rgba(0, 210, 255, .12);--accent-blue: #2563eb;--accent-indigo: #4f46e5;--accent-purple: #8b5cf6;--accent-emerald: #10b981;--accent-amber: #f59e0b;--accent-rose: #f43f5e;--accent-sk-red: #ea0029;--accent-sk-red-subtle: rgba(234, 0, 41, .15);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-tertiary: #64748b;--text-accent: #38bdf8;--text-korean: #cbd5e1;--border-subtle: rgba(255, 255, 255, .08);--border-medium: rgba(255, 255, 255, .15);--border-active: rgba(0, 210, 255, .5);--border-glow: 0 0 15px rgba(0, 210, 255, .25);--font-display: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--font-kr: "Noto Sans KR", sans-serif;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .4);--shadow-md: 0 8px 24px rgba(0, 0, 0, .5);--shadow-lg: 0 16px 48px rgba(0, 0, 0, .7);--shadow-glow: 0 0 30px rgba(0, 210, 255, .15);--ease-spring: cubic-bezier(.175, .885, .32, 1.275);--ease-smooth: cubic-bezier(.16, 1, .3, 1);--duration-fast: .2s;--duration-normal: .35s;--duration-slow: .6s}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;color-scheme:dark;background-color:var(--bg-primary);font-family:var(--font-body)}body{background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;position:relative}#ambient-canvas{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:0;pointer-events:none;opacity:.6}.ambient-grid{position:fixed;top:0;left:0;width:100vw;height:100vh;background-image:linear-gradient(to right,rgba(255,255,255,.02) 1px,transparent 1px),linear-gradient(to bottom,rgba(255,255,255,.02) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(circle at 50% 30%,black 40%,transparent 80%);-webkit-mask-image:radial-gradient(circle at 50% 30%,black 40%,transparent 80%);pointer-events:none;z-index:1}.ambient-glow-orb{position:fixed;width:600px;height:600px;border-radius:50%;filter:blur(120px);pointer-events:none;z-index:0;opacity:.25;transition:all 1s ease}.orb-top{top:-150px;left:50%;transform:translate(-50%);background:radial-gradient(circle,var(--accent-cyan) 0%,rgba(37,99,235,0) 70%)}.orb-mid{top:45%;right:-10%;background:radial-gradient(circle,var(--accent-indigo) 0%,rgba(139,92,246,0) 70%)}.orb-bottom{bottom:0%;left:-10%;background:radial-gradient(circle,var(--accent-cyan) 0%,rgba(16,185,129,0) 70%)}.app-wrapper{position:relative;z-index:2;display:flex;flex-direction:column;min-height:100vh}.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}.site-header{position:sticky;top:0;z-index:100;background:#06080dbf;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border-subtle);transition:background .3s ease,border-color .3s ease}.site-header.scrolled{background:#06080deb;border-bottom:1px solid var(--border-medium);box-shadow:var(--shadow-sm)}.nav-content{display:flex;align-items:center;justify-content:space-between;height:72px}.brand-logo{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--text-primary)}.brand-icon{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--bg-tertiary),var(--bg-secondary));border:1px solid var(--accent-cyan-subtle);display:flex;align-items:center;justify-content:center;box-shadow:0 0 15px #00d2ff26;transition:transform var(--duration-fast) var(--ease-spring),border-color var(--duration-fast)}.brand-logo:hover .brand-icon{transform:scale(1.05);border-color:var(--accent-cyan)}.brand-text{display:flex;flex-direction:column}.brand-title{font-family:var(--font-display);font-size:1.25rem;font-weight:700;letter-spacing:-.02em;background:linear-gradient(120deg,#ffffff 40%,var(--accent-cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.brand-korean{font-family:var(--font-kr);font-size:.72rem;font-weight:500;color:var(--text-tertiary);letter-spacing:.05em}.nav-menu{display:flex;align-items:center;gap:32px;list-style:none}.nav-link{text-decoration:none;font-size:.9rem;font-weight:500;color:var(--text-secondary);transition:color var(--duration-fast) ease;position:relative}.nav-link:hover,.nav-link.active{color:var(--accent-cyan)}.nav-link.active:after{content:"";position:absolute;bottom:-6px;left:0;width:100%;height:2px;background:var(--accent-cyan);border-radius:2px;box-shadow:0 0 8px var(--accent-cyan)}.nav-actions{display:flex;align-items:center;gap:12px}.status-pill{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:20px;background:#00d2ff14;border:1px solid rgba(0,210,255,.25);font-family:var(--font-mono);font-size:.75rem;font-weight:600;color:var(--accent-cyan);letter-spacing:.04em;text-transform:uppercase}.status-dot{width:7px;height:7px;border-radius:50%;background-color:var(--accent-cyan);box-shadow:0 0 8px var(--accent-cyan);animation:pulse 2s infinite ease-in-out}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.85)}}.sound-toggle-btn{background:var(--bg-surface);border:1px solid var(--border-subtle);color:var(--text-secondary);width:38px;height:38px;border-radius:10px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--duration-fast) ease}.sound-toggle-btn:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);background:var(--bg-surface-elevated)}.sound-toggle-btn.sound-on{border-color:var(--accent-cyan);color:var(--accent-cyan);box-shadow:0 0 10px var(--accent-cyan-subtle)}.site-footer{margin-top:auto;border-top:1px solid var(--border-subtle);background:var(--bg-secondary);padding:64px 0 32px;position:relative;z-index:10}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:48px;margin-bottom:48px}.footer-col h4{font-family:var(--font-display);font-size:1.1rem;font-weight:600;margin-bottom:16px;color:var(--text-primary)}.footer-desc{color:var(--text-secondary);font-size:.92rem;max-width:420px;line-height:1.7}.footer-links{list-style:none;display:flex;flex-direction:column;gap:10px}.footer-links a{color:var(--text-secondary);text-decoration:none;font-size:.9rem;transition:color var(--duration-fast)}.footer-links a:hover{color:var(--accent-cyan)}.footer-bottom{padding-top:32px;border-top:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;font-size:.85rem;color:var(--text-tertiary)}.footer-kr-tag{font-family:var(--font-kr);color:var(--text-tertiary)}.mobile-nav-toggle{display:none;background:none;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer}@media (max-width: 900px){.nav-menu{display:none}.mobile-nav-toggle{display:block}.footer-grid{grid-template-columns:1fr;gap:32px}.footer-bottom{flex-direction:column;gap:16px;text-align:center}}.hero-section{padding:80px 0 60px;position:relative;overflow:hidden}.hero-badge-row{display:flex;align-items:center;gap:12px;margin-bottom:24px;flex-wrap:wrap}.badge-tag{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:6px;font-family:var(--font-mono);font-size:.75rem;font-weight:500;letter-spacing:.02em;background:var(--bg-surface);border:1px solid var(--border-medium);color:var(--text-secondary)}.badge-tag.badge-cyan{background:var(--accent-cyan-subtle);border-color:#00d2ff4d;color:var(--accent-cyan)}.badge-tag.badge-korean{font-family:var(--font-kr);border-color:#ffffff1f;color:var(--text-korean)}.hero-title{font-family:var(--font-display);font-size:clamp(2.5rem,5.5vw,4.2rem);font-weight:800;line-height:1.1;letter-spacing:-.03em;margin-bottom:20px;max-width:960px}.hero-title .highlight{background:linear-gradient(135deg,#ffffff 30%,var(--accent-cyan) 80%,#38bdf8 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;display:inline}.hero-subtitle{font-size:clamp(1.05rem,2vw,1.25rem);color:var(--text-secondary);max-width:780px;line-height:1.6;margin-bottom:40px}.hero-subtitle strong{color:var(--text-primary);font-weight:600}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px;margin-bottom:40px}.stat-card{background:var(--bg-surface);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-subtle);border-radius:14px;padding:24px 20px;position:relative;overflow:hidden;transition:transform var(--duration-fast) var(--ease-spring),border-color var(--duration-fast),box-shadow var(--duration-fast)}.stat-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:2px;background:linear-gradient(90deg,transparent,var(--accent-cyan),transparent);opacity:0;transition:opacity var(--duration-fast)}.stat-card:hover{transform:translateY(-4px);border-color:#00d2ff66;box-shadow:0 10px 30px #0006,0 0 20px #00d2ff1a}.stat-card:hover:before{opacity:1}.stat-value{font-family:var(--font-display);font-size:2.2rem;font-weight:800;color:#fff;letter-spacing:-.03em;line-height:1.1;margin-bottom:6px;display:flex;align-items:baseline;gap:4px}.stat-value .unit{font-size:1.1rem;font-weight:600;color:var(--accent-cyan)}.stat-label{font-size:.85rem;font-weight:500;color:var(--text-secondary);line-height:1.3}.stat-kr{font-family:var(--font-kr);font-size:.72rem;color:var(--text-tertiary);margin-top:4px}.timeline-controls-sticky{position:sticky;top:72px;z-index:90;background:#06080de0;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border-subtle);padding:14px 0;margin-bottom:60px}.chapter-filter-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;padding:4px 0}.chapter-filter-bar::-webkit-scrollbar{display:none}.chapter-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:30px;color:var(--text-secondary);font-family:var(--font-body);font-size:.85rem;font-weight:500;white-space:nowrap;cursor:pointer;transition:all var(--duration-fast) ease}.chapter-btn .act-num{font-family:var(--font-mono);font-size:.75rem;font-weight:700;color:var(--accent-cyan);padding:2px 6px;background:#00d2ff1a;border-radius:12px}.chapter-btn:hover{background:var(--bg-surface-elevated);color:var(--text-primary);border-color:var(--border-medium)}.chapter-btn.active{background:#00d2ff1f;border-color:var(--accent-cyan);color:#fff;box-shadow:0 0 15px #00d2ff33}.timeline-section{position:relative;padding-bottom:80px}.timeline-spine{position:absolute;top:0;bottom:0;left:50%;width:2px;background:linear-gradient(180deg,var(--accent-cyan) 0%,rgba(0,210,255,.5) 40%,var(--accent-indigo) 70%,var(--accent-emerald) 100%);transform:translate(-50%);z-index:1}.timeline-items{position:relative;z-index:2;display:flex;flex-direction:column;gap:64px}.timeline-item{display:grid;grid-template-columns:1fr 60px 1fr;align-items:center;width:100%;position:relative}.timeline-content-left{grid-column:1;text-align:right;padding-right:32px}.timeline-node-center{grid-column:2;display:flex;justify-content:center;align-items:center;position:relative}.timeline-content-right{grid-column:3;text-align:left;padding-left:32px}.timeline-node-dot{width:22px;height:22px;border-radius:50%;background:var(--bg-primary);border:3px solid var(--accent-cyan);box-shadow:0 0 12px var(--accent-cyan);z-index:3;transition:transform var(--duration-fast) var(--ease-spring),box-shadow var(--duration-fast)}.timeline-item:hover .timeline-node-dot{transform:scale(1.35);box-shadow:0 0 24px var(--accent-cyan),0 0 40px #00d2ff66}.node-year-badge{font-family:var(--font-mono);font-size:.78rem;font-weight:700;color:var(--accent-cyan);padding:4px 10px;background:var(--bg-secondary);border:1px solid rgba(0,210,255,.3);border-radius:16px;white-space:nowrap}.exhibit-card{background:var(--bg-surface);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-subtle);border-radius:16px;padding:28px;box-shadow:var(--shadow-md);text-align:left;cursor:pointer;position:relative;overflow:hidden;transition:transform var(--duration-fast) var(--ease-smooth),border-color var(--duration-fast),box-shadow var(--duration-fast)}.exhibit-card:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at top right,rgba(0,210,255,.08),transparent 70%);pointer-events:none}.exhibit-card:hover{transform:translateY(-4px);border-color:var(--border-active);box-shadow:var(--shadow-lg),var(--border-glow)}.card-header-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.card-act-label{font-family:var(--font-mono);font-size:.75rem;font-weight:700;color:var(--accent-cyan);text-transform:uppercase;letter-spacing:.05em}.card-date-badge{font-family:var(--font-mono);font-size:.8rem;font-weight:600;color:var(--text-primary);background:var(--bg-tertiary);padding:2px 8px;border-radius:6px;border:1px solid var(--border-medium)}.exhibit-title{font-family:var(--font-display);font-size:1.35rem;font-weight:700;color:var(--text-primary);line-height:1.3;margin-bottom:6px}.exhibit-kr-title{font-family:var(--font-kr);font-size:.88rem;font-weight:500;color:var(--text-tertiary);margin-bottom:14px}.exhibit-summary{color:var(--text-secondary);font-size:.94rem;line-height:1.6;margin-bottom:18px}.card-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px}.tech-tag{font-family:var(--font-mono);font-size:.72rem;padding:3px 8px;background:var(--bg-tertiary);border:1px solid var(--border-subtle);border-radius:4px;color:var(--text-secondary)}.card-action-cue{display:flex;align-items:center;gap:6px;font-size:.82rem;font-weight:600;color:var(--accent-cyan);margin-top:8px}.card-action-cue svg{transition:transform var(--duration-fast)}.exhibit-card:hover .card-action-cue svg{transform:translate(4px)}@media (max-width: 900px){.stats-grid{grid-template-columns:repeat(2,1fr)}.timeline-spine{left:24px}.timeline-item{grid-template-columns:48px 1fr;gap:16px}.timeline-content-left{grid-column:2;text-align:left;padding-right:0;padding-left:0}.timeline-node-center{grid-column:1;justify-content:flex-start}.timeline-content-right{grid-column:2;padding-left:0}}@media (max-width: 550px){.stats-grid{grid-template-columns:1fr}.hero-section{padding:48px 0 40px}}.telecom-console-section{padding:60px 0;border-top:1px solid var(--border-subtle);border-bottom:1px solid var(--border-subtle);background:radial-gradient(circle at 50% 0%,rgba(0,210,255,.05),transparent 60%);margin:40px 0 80px}.console-wrapper{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;background:var(--bg-surface);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-medium);border-radius:20px;padding:40px;box-shadow:var(--shadow-lg)}.console-info h3{font-family:var(--font-display);font-size:1.8rem;font-weight:700;margin-bottom:12px;color:#fff}.console-info p{color:var(--text-secondary);font-size:.95rem;line-height:1.6;margin-bottom:24px}.frequency-legend{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:20px}.legend-item{background:var(--bg-tertiary);border:1px solid var(--border-subtle);border-radius:8px;padding:10px 14px;font-family:var(--font-mono);font-size:.8rem;color:var(--text-secondary)}.legend-item span{color:var(--accent-cyan);font-weight:600}.dtmf-keypad-panel{display:flex;flex-direction:column;align-items:center;gap:20px;background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:16px;padding:24px}.keypad-screen{width:100%;background:#020408;border:1px solid rgba(0,210,255,.3);border-radius:10px;padding:14px 18px;display:flex;flex-direction:column;gap:4px;box-shadow:inset 0 2px 10px #000c}.screen-label{font-family:var(--font-mono);font-size:.7rem;text-transform:uppercase;color:var(--text-tertiary);display:flex;justify-content:space-between}.screen-number{font-family:var(--font-mono);font-size:1.4rem;font-weight:700;color:var(--accent-cyan);letter-spacing:.1em;min-height:32px;display:flex;align-items:center}.screen-freq{font-family:var(--font-mono);font-size:.72rem;color:#38bdf8}.keypad-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;width:100%;max-width:280px}.key-btn{aspect-ratio:1;background:var(--bg-surface);border:1px solid var(--border-medium);border-radius:12px;color:var(--text-primary);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 12px #0000004d;transition:all .1s ease;user-select:none;-webkit-user-select:none}.key-btn:hover{background:var(--bg-surface-elevated);border-color:var(--accent-cyan);transform:translateY(-2px)}.key-btn:active,.key-btn.active{transform:translateY(1px);background:#00d2ff33;border-color:var(--accent-cyan);box-shadow:0 0 15px var(--accent-cyan-glow)}.key-number{font-family:var(--font-display);font-size:1.4rem;font-weight:700;line-height:1}.key-letters{font-family:var(--font-mono);font-size:.65rem;color:var(--text-tertiary);margin-top:2px;letter-spacing:.05em}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#04060ad9;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;pointer-events:none;transition:opacity var(--duration-normal) ease}.modal-overlay.active{opacity:1;pointer-events:auto}.modal-dialog{background:var(--bg-secondary);border:1px solid var(--border-medium);border-radius:20px;width:100%;max-width:760px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg),0 0 50px #00d2ff26;transform:scale(.95) translateY(20px);transition:transform var(--duration-normal) var(--ease-spring);position:relative}.modal-overlay.active .modal-dialog{transform:scale(1) translateY(0)}.modal-header{padding:28px 32px 20px;border-bottom:1px solid var(--border-subtle);display:flex;align-items:flex-start;justify-content:space-between;gap:16px;position:sticky;top:0;background:var(--bg-secondary);z-index:10}.modal-meta-tag{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:.78rem;color:var(--accent-cyan);margin-bottom:8px}.modal-title{font-family:var(--font-display);font-size:1.6rem;font-weight:700;color:var(--text-primary);line-height:1.25}.modal-kr-title{font-family:var(--font-kr);font-size:.95rem;color:var(--text-tertiary);margin-top:4px}.modal-close-btn{background:var(--bg-tertiary);border:1px solid var(--border-subtle);color:var(--text-secondary);width:36px;height:36px;border-radius:10px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--duration-fast)}.modal-close-btn:hover{background:var(--bg-surface-elevated);color:#fff;border-color:var(--accent-cyan)}.modal-body{padding:32px;display:flex;flex-direction:column;gap:24px}.modal-section-title{font-family:var(--font-mono);font-size:.82rem;text-transform:uppercase;color:var(--accent-cyan);letter-spacing:.08em;margin-bottom:12px;display:flex;align-items:center;gap:8px}.modal-text{color:var(--text-secondary);font-size:.96rem;line-height:1.7}.modal-spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.spec-box{background:var(--bg-tertiary);border:1px solid var(--border-subtle);border-radius:10px;padding:14px 16px}.spec-key{font-family:var(--font-mono);font-size:.72rem;color:var(--text-tertiary);text-transform:uppercase;margin-bottom:4px}.spec-val{font-size:.95rem;font-weight:600;color:var(--text-primary)}.horizon-section{padding:60px 0 80px}.horizon-banner{background:linear-gradient(135deg,#0c1017e6,#131923f2);border:1px solid var(--border-medium);border-radius:20px;padding:48px;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}.horizon-banner:before{content:"";position:absolute;top:0;right:0;width:300px;height:300px;background:radial-gradient(circle,rgba(0,210,255,.15),transparent 70%);filter:blur(40px)}.horizon-content{position:relative;z-index:2;max-width:680px}.horizon-tag{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:20px;background:#10b9811f;border:1px solid rgba(16,185,129,.3);font-family:var(--font-mono);font-size:.75rem;color:var(--accent-emerald);margin-bottom:16px}.horizon-title{font-family:var(--font-display);font-size:2rem;font-weight:700;color:#fff;margin-bottom:12px}.horizon-desc{color:var(--text-secondary);font-size:1rem;line-height:1.65;margin-bottom:24px}@media (max-width: 900px){.console-wrapper{grid-template-columns:1fr;padding:24px}.horizon-banner{padding:32px 24px}.modal-spec-grid{grid-template-columns:1fr}}