/* Header and centered full-height opening, matching the reference proportions. */
.site-header { background: #000; }
.header-inner { width: min(1060px, calc(100% - 48px)); min-height: 70px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 32px; padding-block: 10px; }
.main-nav { display: flex; align-items: center; gap: 42px; font-size: 18px; font-weight: 700; }
.main-nav a:hover { color: #ef4444; }
.menu-toggle { display: none; }
.hero { min-height: 850px; height: 100dvh; border-bottom: 1px solid #ffffff0d; background: radial-gradient(ellipse at center, #ca8a041e, #050505 68%); }
.hero-content { width: min(1152px, calc(100% - 32px)); height: 100%; min-height: inherit; margin: auto; display: flex; flex-direction: column; align-items: center; text-align: center; }
.hero-heading { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; padding-bottom: 40px; }
.hero-badge { display: inline-flex; padding: 8px 20px; border: 1px solid #dc26264d; border-radius: 999px; background: #ffffff0d; box-shadow: 0 0 20px #dc262640; font-size: 12px; font-weight: 700; letter-spacing: 2px; margin-bottom: 32px; }
.hero h1 { font-size: clamp(36px, 5.625vw, 72px); font-weight: 900; letter-spacing: -2px; line-height: 1; }
.hero h1 span { color: var(--red); text-shadow: 0 0 15px #dc262680; }
.hero-actions { position: relative; display: flex; flex-direction: column; align-items: center; gap: 16px; padding: 8px 16px; width: 100%; }
.hero-address { position: absolute; top: calc(100% + 4px); left: 0; right: 0; font-size: 13px; color: #b7b4ae; }
.hero-space { flex: 1; }
.section { padding: 96px 0; border-bottom: 1px solid #111827; }
.section-heading { margin-bottom: 48px; }
.section-heading p { margin-top: 12px; color: var(--muted); font-size: 17px; }
.heading-rule { border-bottom: 2px solid #1f2937; padding-bottom: 24px; }

/* Paired cards and alternating introduction steps. */
.quick-links { background-color: #030712; background-image: repeating-linear-gradient(45deg, transparent 0 5px, #11111190 5px 6px), repeating-linear-gradient(-45deg, transparent 0 5px, #11111190 5px 6px); }
.quick-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.feature-card { --card-accent: var(--red); display: block; position: relative; overflow: hidden; background: #0a0a0a; border: 2px solid #1f2937; border-radius: 16px; padding: 40px; transition: border-color .2s, transform .2s, box-shadow .2s; }
.card-gold { --card-accent: var(--gold); }
.feature-card::before { content: ""; position: absolute; width: 128px; height: 128px; top: 0; right: 0; border-bottom-left-radius: 100%; background: var(--card-accent); opacity: .09; pointer-events: none; }
.feature-card:hover { transform: translateY(-6px); border-color: var(--card-accent); box-shadow: 0 0 24px color-mix(in srgb, var(--card-accent), transparent 75%); }
.card-heading { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.card-heading h3 { font-family: DisplayKo, "Malgun Gothic", sans-serif; font-weight: 400; }
.card-icon { flex: 0 0 64px; height: 64px; display: grid; place-items: center; border-radius: 50%; color: var(--card-accent); background: color-mix(in srgb, var(--card-accent), transparent 85%); font-size: 36px; }
.tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.tags span { padding: 4px 12px; border: 1px solid #374151; background: #111827; color: #d1d5db; border-radius: 4px; font-size: 13px; }
.card-note { background: #00000080; border-left: 4px solid var(--card-accent); border-radius: 4px; padding: 16px; color: var(--muted); }
.card-more { display: inline-block; margin-top: 24px; color: var(--card-accent); font-size: 14px; font-weight: 700; }
.steps-section { background: #000; }
.steps-section .section-heading { margin-bottom: 64px; }
.steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 17%; row-gap: 48px; }
.step:nth-child(odd) { grid-column: 1; text-align: right; }
.step:nth-child(even) { grid-column: 2; }
.step h3 { color: #ef4444; margin-bottom: 10px; }
.step:nth-child(2) h3 { color: var(--gold); }
.step:nth-child(3) h3 { color: var(--yellow); }
.step p { color: var(--muted); font-size: 14px; }

/* Diagonal red panel and two decorative moving strips. */
.connection-section { padding: 128px 0; background: #b82020; background-image: repeating-linear-gradient(45deg, #0000000c 0 10px, transparent 10px 20px); clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%); }
.connection-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: center; gap: 48px; }
.connection-intro h2 { color: #050505; font-size: clamp(38px, 4.6vw, 66px); transform: rotate(-2deg); line-height: 1.1; margin-bottom: 24px; }
.connection-intro h2 span { color: #fff; }
.connection-intro p { color: #080808; font-size: 21px; font-weight: 700; line-height: 1.5; }
.connection-list { margin: 0; padding: 32px; list-style: none; background: #090909e8; border: 4px solid #000; box-shadow: 0 20px 40px #0006; transform: rotate(2deg); }
.connection-list li { display: flex; align-items: flex-start; gap: 16px; }
.connection-list li + li { margin-top: 24px; }
.connection-list li > span { font-size: 30px; font-weight: 900; color: #ef4444; line-height: 1.3; }
.connection-list h3 { font-size: 18px; }
.connection-list p { font-size: 14px; color: #d1d5db; margin-top: 5px; }
.simple-section { padding: 80px 0; overflow: hidden; background: #1a0505; box-shadow: inset 0 0 100px #000; }
.simple-section .section-heading { margin-bottom: 32px; padding-inline: 20px; }
.simple-section h2 { font-family: Arial, sans-serif; font-weight: 900; letter-spacing: 3px; }
.simple-section .section-heading p { color: #ef4444; font-family: NoteKo, cursive; font-size: 30px; }
.ticker { width: 100%; overflow: hidden; margin-block: 26px; }
.ticker-dark { background: #000; border-block: 1px solid #dc262650; transform: rotate(-1deg); color: #b45b5b; }
.ticker-red { background: var(--red); transform: rotate(1deg); color: #070707; }
.ticker-track { display: flex; width: max-content; animation: ticker-scroll 28s linear infinite; }
.ticker-track span { flex-shrink: 0; padding: 12px 24px; white-space: nowrap; font: 400 32px/1.4 DisplayKo, sans-serif; }
.ticker-red .ticker-track { animation-direction: reverse; }
.ticker-red .ticker-track span { font-size: 25px; }
.simple-copy { max-width: 720px; padding: 0 20px; margin: 36px auto 0; text-align: center; color: #d1d5db; }
@keyframes ticker-scroll { to { transform: translateX(-50%); } }

/* Lightweight phone illustration, built entirely with CSS. */
.mobile-section { background: #0a0a0a; }
.mobile-grid { display: grid; grid-template-columns: 1.3fr 1fr; align-items: center; gap: 48px; }
.mobile-copy h2 { margin-bottom: 24px; }
.handwritten { font: 400 30px/1.4 NoteKo, "Malgun Gothic", sans-serif; color: #d1d5db; margin-bottom: 32px; }
.checklist { list-style: none; margin: 0; padding: 0; }
.checklist li { margin-top: 16px; border: 1px solid #1f2937; background: #00000080; border-radius: 4px; padding: 12px 16px; color: var(--muted); }
.checklist li::before { content: "✓"; color: var(--gold); margin-right: 12px; font-weight: 900; }
.phone { width: 280px; height: 550px; position: relative; justify-self: center; border: 12px solid #222; border-block-width: 24px; border-radius: 40px; box-shadow: 0 20px 40px #000c; background: #111; overflow: hidden; }
.phone-notch { position: absolute; top: 0; left: 30%; width: 40%; height: 25px; border-radius: 0 0 16px 16px; background: #222; z-index: 1; }
.phone-screen { padding: 40px 16px 16px; }
.phone-brand { display: flex; align-items: center; margin-bottom: 24px; font-size: 21px; font-weight: 900; }
.phone-brand > span { color: #ef4444; }
.phone-brand i { width: 24px; height: 4px; border-radius: 4px; background: #555; margin-left: auto; }
.phone-preview { display: flex; flex-direction: column; gap: 10px; justify-content: center; align-items: center; height: 160px; background: radial-gradient(circle, #401010, #090909); border: 1px solid #374151; border-radius: 8px; margin-bottom: 16px; }
.phone-preview > span { display: grid; place-items: center; width: 48px; height: 48px; background: var(--red); border-radius: 50%; font-size: 26px; box-shadow: 0 0 18px #dc262660; }
.phone-preview strong { font-size: 14px; }
.phone-row { height: 64px; border-radius: 4px; background: #1f2937; display: flex; padding: 8px; gap: 12px; margin-bottom: 12px; align-items: center; }
.phone-row b { width: 70px; height: 48px; background: #374151; border-radius: 3px; }
.phone-row span { width: 80px; height: 8px; background: #6b7280; border-radius: 4px; box-shadow: 0 14px #4b5563; transform: translateY(-6px); }
.phone-screen > p { margin-top: 18px; color: #9ca3af; font-size: 11px; text-align: center; }
.phone-home { position: absolute; bottom: 16px; left: 33%; width: 34%; height: 4px; background: #444; border-radius: 4px; }

/* Four native disclosure cards; no hover-only content on mobile. */
.tips-section { background: #151515; }
.tips-section h2 { font-size: clamp(28px, 3.1vw, 36px); }
.tip-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; align-items: start; }
.tip-card { background: #111827; border: 2px solid #374151; border-radius: 8px; overflow: hidden; }
.tip-card summary { display: flex; min-height: 256px; align-items: center; justify-content: center; flex-direction: column; padding: 24px; list-style: none; cursor: pointer; text-align: center; }
.tip-card summary::-webkit-details-marker { display: none; }
.tip-symbol { font-size: 48px; line-height: 1.2; margin-bottom: 16px; color: #e5e7eb; }
.tip-card summary > span:not(.tip-symbol) { font: 400 28px/1.2 NoteKo, sans-serif; }
.tip-card small { color: #a7aab4; font-size: 11px; margin-top: 18px; }
.tip-card[open] { border-color: var(--red); }
.tip-card[open] summary { min-height: 165px; background: #991b1b; }
.tip-card[open] .tip-symbol { display: none; }
.tip-card[open] small { color: #fca5a5; }
.tip-card > p { padding: 22px; color: #e5e7eb; font-size: 14px; }
.tip-card:nth-child(2)[open] summary { background: #795203; }
.tip-card:nth-child(3)[open] summary { background: #665300; }
.tip-card:nth-child(4)[open] summary { background: #334155; }

/* Chalkboard, ring notebook and paper file retain the reference's visual rhythm. */
.chalk-section { background: #1a2e24; border-bottom-color: #000; }
.chalk-section .section-heading p { color: #4ade80; }
.chalkboard { background: #2c3e35; border: 8px solid #1a1411; padding: 48px; border-radius: 4px; box-shadow: inset 0 0 50px #000c; }
.chalkboard article + article { margin-top: 40px; }
.chalkboard h3 { font: 400 30px/1.3 NoteKo, sans-serif; margin-bottom: 10px; }
.chalkboard h3 span { color: #fde047; }
.chalkboard p { color: #d1d5db; font: 400 25px/1.5 NoteKo, sans-serif; padding-left: 32px; }
.notebook-section { background: #1e1e1e; }
.notebook-section .section-heading h2 { font-size: 34px; }
.notebook-section .section-heading p { color: #ef4444; }
.notebook { position: relative; padding: 48px 48px 48px 68px; background: #fef3c7; color: #111; border-left: 8px solid #991b1b; border-radius: 8px; transform: rotate(1deg); box-shadow: 0 20px 40px #0008; }
.notebook::before { content: ""; position: absolute; inset: 16px auto 16px 2px; width: 24px; background: repeating-linear-gradient(to bottom, transparent 0 32px, #1f2937 32px 40px, transparent 40px 70px); }
.notebook article + article { margin-top: 28px; }
.notebook article:not(:last-child) { padding-bottom: 20px; border-bottom: 2px dashed #9ca3af; }
.notebook h3 { font-size: 20px; margin-bottom: 10px; }
.notebook h3 span { color: #b91c1c; }
.notebook p { color: #1e3a8a; font: 400 26px/1.3 NoteKo, sans-serif; }
.notebook kbd { font: inherit; }
.address-section { background: #0a0a0a; }
.address-file { background: #f5f5dc; color: #111; padding: 56px; position: relative; border: 1px solid #d1d5db; box-shadow: -10px 10px 20px #0008; }
.file-stamp { position: absolute; right: 22px; top: 22px; border: 4px solid #dc2626; padding: 4px 12px; color: #dc2626; font: 900 24px/1.3 monospace; transform: rotate(15deg); opacity: .7; pointer-events: none; }
.file-heading { border-bottom: 4px solid #111; padding: 25px 0 20px; margin-bottom: 40px; }
.file-heading h2 { font-size: 36px; }
.file-heading p { color: #374151; margin-top: 6px; }
.file-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; align-items: center; }
.file-notes article { background: #ffffff80; border: 1px solid #9ca3af; padding: 16px; }
.file-notes article + article { margin-top: 22px; }
.file-notes h3 { font-size: 18px; margin-bottom: 10px; }
.file-notes h3 span { display: inline-block; background: #dc2626; color: #fff; font-size: 13px; padding: 2px 6px; margin-right: 7px; }
.file-notes p { font-size: 14px; color: #1f2937; }
.address-card { position: relative; border: 4px solid #111; padding: 32px 24px; background: #eaeaea; }
.address-card::before { content: ""; position: absolute; top: -14px; left: calc(50% - 32px); width: 64px; height: 24px; background: #fff9; transform: rotate(-3deg); box-shadow: 0 2px 3px #0002; }
.address-label { font-size: 16px; font-weight: 700; padding-bottom: 20px; border-bottom: 2px solid #9ca3af; }
.domain { font-size: clamp(25px, 2.55vw, 36px); font-weight: 900; margin-block: 22px; letter-spacing: -1px; white-space: nowrap; }
.address-card > p:not(.domain):not(.address-label) { color: #374151; font-size: 15px; }
.address-card > a { display: block; margin-top: 30px; padding-top: 18px; border-top: 2px solid #111; font-size: 13px; font-weight: 700; color: #b91c1c; }
.address-file .domain-number { color: #dc2626; }
.final-section { border-top: 1px solid #ffffff1a; }
.final-section h2 { font-size: 36px; }
.final-icon { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 50%; background: #dc262630; color: #ef4444; box-shadow: 0 0 25px #dc262650; font-size: 36px; margin: 0 auto 24px; }
.final-section p { margin-top: 28px; color: var(--muted); }
.final-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; margin-top: 40px; }
.site-footer { background: #000; padding: 64px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 48px; }
.footer-grid h2 { font: 700 17px/1.5 "Malgun Gothic", sans-serif; margin-bottom: 20px; }
.footer-grid p { color: #9ca3af; font-size: 14px; margin-top: 16px; }
.footer-grid a:not(.brand) { display: block; color: #d1d5db; margin-top: 10px; font-size: 14px; }
.footer-grid a:hover { color: #ef4444; }
.footer-grid .footer-domain { color: #fff; font-size: 20px; font-weight: 700; }
.copyright { color: #6b7280; border-top: 1px solid #1f2937; margin-top: 48px; padding-top: 24px; font-size: 13px; }