:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-alt: #edf2f8;
  --surface-dark: #07111f;
  --surface-dark-2: #0b1728;
  --text: #142033;
  --muted: #5e6b7e;
  --line: #dbe3ee;
  --white: #ffffff;
  --aws: #ff9900;
  --aws-soft: #fff1d8;
  --azure: #168bd2;
  --azure-soft: #dff3ff;
  --cyan: #2dd4bf;
  --purple: #8b5cf6;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #f59e0b;
  --shadow-sm: 0 10px 28px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 25px 70px rgba(2, 12, 27, 0.17);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --container: 1180px;
  --header-height: 76px;
}

[data-theme="dark"] {
  --bg: #07111f;
  --surface: #0c192a;
  --surface-alt: #101f33;
  --text: #eef5ff;
  --muted: #a7b5c8;
  --line: #24344a;
  --shadow-sm: 0 12px 30px rgba(0, 0, 0, 0.28);
  --aws-soft: rgba(255, 153, 0, 0.12);
  --azure-soft: rgba(22, 139, 210, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 20px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  transition: background 0.25s ease, color 0.25s ease;
}
body.menu-open { overflow: hidden; }
button, input { font: inherit; }
a { color: inherit; }
img { max-width: 100%; display: block; }
code, pre { font-family: "Cascadia Code", "Fira Code", Consolas, monospace; }

.skip-link {
  position: fixed;
  left: 20px;
  top: -100px;
  padding: 10px 16px;
  background: var(--white);
  color: #07111f;
  border-radius: 8px;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus { top: 20px; }

.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.section { position: relative; padding: 104px 0; overflow: hidden; }
.section-soft { background: var(--surface-alt); }
.section-dark { background: var(--surface-dark); color: var(--white); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
  backdrop-filter: blur(18px);
}
.nav { height: 100%; display: flex; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; min-width: max-content; }
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #ffb13b, #ff8400 52%, #168bd2 53%, #0073bb);
  box-shadow: 0 9px 24px rgba(20, 117, 180, 0.25);
}
.brand-cloud { color: white; font-size: 24px; transform: translateY(-1px); }
.brand > span:last-child { display: flex; flex-direction: column; line-height: 1.1; }
.brand strong { font-size: 15px; letter-spacing: -0.01em; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 27px; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: 14px; font-weight: 650; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.theme-toggle, .menu-toggle {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 0.2s, border-color 0.2s;
}
.theme-toggle:hover, .menu-toggle:hover { transform: translateY(-2px); border-color: var(--azure); }
.menu-toggle { display: none; }
.menu-toggle span { display: block; width: 19px; height: 2px; background: currentColor; border-radius: 99px; margin: 2px; }

.hero { min-height: calc(100vh - var(--header-height)); display: grid; align-items: center; padding: 82px 0 96px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 80px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--azure); font-weight: 800; font-size: 12px; letter-spacing: 0.13em; text-transform: uppercase; }
.eyebrow span { width: 24px; height: 2px; border-radius: 99px; background: linear-gradient(90deg, var(--aws), var(--azure)); }
.hero h1 { max-width: 760px; margin: 21px 0 22px; font-size: clamp(2.85rem, 6vw, 5.4rem); line-height: 0.98; letter-spacing: -0.06em; }
.gradient-text { background: linear-gradient(92deg, var(--aws) 4%, #f7b733 38%, var(--azure) 70%, #7357ff); -webkit-background-clip: text; color: transparent; }
.hero-description { max-width: 650px; margin: 0; font-size: clamp(1rem, 1.6vw, 1.18rem); color: var(--muted); }
.hero-actions { display: flex; gap: 13px; flex-wrap: wrap; margin: 34px 0 42px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 0 22px; border-radius: 14px; border: 1px solid transparent; text-decoration: none; font-weight: 800; cursor: pointer; transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: linear-gradient(135deg, #147ec2, #7357ff); box-shadow: 0 13px 34px rgba(30, 117, 194, 0.25); }
.button-secondary { background: var(--surface); color: var(--text); border-color: var(--line); }
.section-dark .button-secondary { background: rgba(255,255,255,0.07); border-color: rgba(255,255,255,0.18); color: white; }
.hero-highlights { display: flex; gap: 34px; }
.hero-highlights div { display: grid; gap: 1px; }
.hero-highlights strong { font-size: 1.18rem; }
.hero-highlights span { color: var(--muted); font-size: 0.78rem; }

.hero-visual { position: relative; min-height: 540px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; inset: 8% 5%; border-radius: 50%; background: radial-gradient(circle, color-mix(in srgb, var(--azure) 16%, transparent), transparent 68%); filter: blur(10px); }
.cloud-core { position: relative; z-index: 3; width: 178px; height: 178px; border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; color: white; background: linear-gradient(145deg, #142c48, #081422); border: 1px solid rgba(255,255,255,0.12); box-shadow: 0 28px 70px rgba(2, 11, 24, 0.35), inset 0 0 45px rgba(36, 149, 221, 0.13); }
.core-icon { font-size: 40px; }
.cloud-core strong { font-size: 15px; letter-spacing: 0.2em; margin-top: 5px; }
.cloud-core small { font-size: 10px; color: #9fb0c6; margin-top: 5px; }
.orbit { position: absolute; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--azure) 25%, transparent); }
.orbit-one { width: 330px; height: 330px; animation: spin 24s linear infinite; }
.orbit-two { width: 485px; height: 485px; border-style: dashed; animation: spin-reverse 38s linear infinite; }
.orbit::before, .orbit::after { content: ""; position: absolute; width: 10px; height: 10px; border-radius: 50%; background: var(--aws); box-shadow: 0 0 18px var(--aws); }
.orbit::before { left: 25px; top: 72px; }
.orbit::after { right: 18px; bottom: 93px; background: var(--azure); box-shadow: 0 0 18px var(--azure); }
.provider-card { position: absolute; z-index: 4; min-width: 250px; display: flex; align-items: center; gap: 13px; padding: 15px 17px; border: 1px solid color-mix(in srgb, var(--line) 75%, transparent); background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: blur(14px); border-radius: 18px; box-shadow: var(--shadow-lg); }
.provider-card strong, .provider-card small { display: block; }
.provider-card strong { font-size: 13px; }
.provider-card small { color: var(--muted); margin-top: 3px; font-size: 10px; }
.provider-aws { top: 65px; left: 0; animation: float 4.7s ease-in-out infinite; }
.provider-azure { right: -12px; bottom: 66px; animation: float 5.4s ease-in-out infinite reverse; }
.provider-badge { width: 43px; height: 43px; border-radius: 13px; display: inline-grid; place-items: center; font-size: 11px; font-weight: 900; letter-spacing: 0.04em; flex-shrink: 0; }
.aws-badge { background: var(--aws-soft); color: #cc7100; border: 1px solid color-mix(in srgb, var(--aws) 32%, transparent); }
.azure-badge { background: var(--azure-soft); color: #0573b4; border: 1px solid color-mix(in srgb, var(--azure) 30%, transparent); }
.float-chip { position: absolute; z-index: 4; padding: 8px 12px; border-radius: 99px; background: color-mix(in srgb, var(--surface) 90%, transparent); border: 1px solid var(--line); box-shadow: var(--shadow-sm); font-size: 11px; font-weight: 750; }
.chip-security { right: 12px; top: 112px; }
.chip-network { left: 30px; bottom: 130px; }
.chip-data { right: 55px; top: 250px; }
.hero-glow { position: absolute; width: 440px; height: 440px; filter: blur(80px); opacity: 0.13; border-radius: 50%; pointer-events: none; }
.hero-glow-a { left: -250px; top: -40px; background: var(--aws); }
.hero-glow-b { right: -250px; bottom: 0; background: var(--azure); }

.section-heading { max-width: 720px; margin-bottom: 44px; }
.section-heading h2 { margin: 13px 0 13px; font-size: clamp(2rem, 4.5vw, 3.45rem); line-height: 1.05; letter-spacing: -0.045em; }
.section-heading p { color: var(--muted); margin: 0; font-size: 1.02rem; }
.section-heading.light p { color: #a9b8cb; }
.section-heading.light .eyebrow { color: #63c6ff; }

.learning-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step-card { position: relative; padding: 28px 25px; min-height: 245px; border-radius: var(--radius-md); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-sm); transition: transform 0.25s, border-color 0.25s; }
.step-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--azure) 45%, var(--line)); }
.step-number { position: absolute; right: 20px; top: 17px; color: color-mix(in srgb, var(--muted) 40%, transparent); font-size: 12px; font-weight: 900; letter-spacing: 0.12em; }
.step-icon { width: 50px; height: 50px; border-radius: 15px; display: grid; place-items: center; font-size: 24px; background: linear-gradient(145deg, var(--azure-soft), var(--aws-soft)); }
.step-card h3 { margin: 25px 0 10px; font-size: 1.13rem; }
.step-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.concept-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.concept-card { padding: 25px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.concept-icon { width: 45px; height: 45px; border-radius: 14px; display: grid; place-items: center; color: white; font-size: 20px; background: linear-gradient(135deg, var(--azure), var(--purple)); }
.concept-card:nth-child(2) .concept-icon, .concept-card:nth-child(4) .concept-icon { background: linear-gradient(135deg, var(--aws), #f04c4c); }
.concept-card h3 { margin: 20px 0 8px; font-size: 1.08rem; }
.concept-card > p { color: var(--muted); font-size: 0.9rem; margin: 0; min-height: 68px; }
.mini-example { margin-top: 18px; padding-top: 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.78rem; }
.mini-example strong { color: var(--text); }

.service-models { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 35px; align-items: center; margin-top: 48px; padding: 38px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-sm); }
.label { display: inline-block; color: var(--azure); font-size: 0.72rem; font-weight: 850; letter-spacing: 0.12em; text-transform: uppercase; }
.model-intro h3, .responsibility-copy h3, .mini-projects-heading h3 { margin: 9px 0 10px; font-size: clamp(1.5rem, 2.5vw, 2.25rem); line-height: 1.1; letter-spacing: -0.035em; }
.model-intro p { color: var(--muted); margin: 0; }
.model-stack { display: grid; gap: 8px; }
.model-row { display: grid; grid-template-columns: 0.7fr 1.2fr auto; gap: 18px; align-items: center; padding: 16px 19px; border-radius: 14px; }
.model-row > div { display: grid; }
.model-row strong { font-size: 0.95rem; }
.model-row span, .model-row p { font-size: 0.74rem; margin: 0; }
.model-row > div span { opacity: 0.7; }
.model-saas { background: color-mix(in srgb, var(--cyan) 15%, var(--surface)); }
.model-paas { background: color-mix(in srgb, var(--azure) 14%, var(--surface)); }
.model-iaas { background: color-mix(in srgb, var(--purple) 13%, var(--surface)); }
.control-tag { white-space: nowrap; padding: 6px 9px; background: color-mix(in srgb, var(--surface) 65%, transparent); border-radius: 99px; }

.region-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 48px; }
.region-card { padding: 30px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.provider-title { display: flex; gap: 14px; align-items: center; }
.provider-title h3 { margin: 0; font-size: 1.16rem; }
.provider-title p { margin: 2px 0 0; color: var(--muted); font-size: 0.78rem; }
.region-diagram { margin: 26px 0 17px; padding: 18px; border: 1px dashed color-mix(in srgb, var(--azure) 35%, var(--line)); border-radius: 18px; background: color-mix(in srgb, var(--azure-soft) 30%, var(--surface)); }
.aws-panel .region-diagram { border-color: color-mix(in srgb, var(--aws) 38%, var(--line)); background: color-mix(in srgb, var(--aws-soft) 35%, var(--surface)); }
.region-name { display: block; margin-bottom: 13px; font-size: 0.72rem; font-weight: 900; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.zones { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.zones div { padding: 17px 10px; text-align: center; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-sm); }
.zones strong, .zones small { display: block; }
.zones strong { font-size: 0.85rem; }
.zones small { color: var(--muted); font-size: 0.62rem; margin-top: 4px; }
.region-note { color: var(--muted); font-size: 0.84rem; }
.text-link { display: inline-block; margin-top: 8px; color: var(--azure); font-size: 0.82rem; font-weight: 800; text-decoration: none; }
.aws-panel .text-link { color: #d77c00; }

.responsibility { margin-top: 48px; padding: 40px; display: grid; grid-template-columns: 0.7fr 1.3fr; align-items: center; gap: 40px; border-radius: var(--radius-lg); background: linear-gradient(135deg, #091a2d, #102846); color: white; box-shadow: var(--shadow-lg); }
.responsibility-copy p { color: #b5c2d2; margin: 0; }
.responsibility-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.responsibility-columns > div { padding: 23px; border: 1px solid rgba(255,255,255,0.12); border-radius: 18px; background: rgba(255,255,255,0.06); }
.responsibility-icon { display: block; font-size: 25px; margin-bottom: 9px; }
.responsibility-columns ul { margin: 12px 0 0; padding-left: 17px; color: #b5c2d2; font-size: 0.78rem; }

.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.filter-button, .tab-button, .architecture-button { border: 1px solid rgba(255,255,255,0.14); background: rgba(255,255,255,0.06); color: #b8c6d7; padding: 9px 14px; border-radius: 99px; cursor: pointer; font-weight: 750; font-size: 0.78rem; transition: 0.2s; }
.filter-button:hover, .filter-button.active { background: white; color: #07111f; border-color: white; }
.comparison-table-wrap { overflow-x: auto; border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-md); background: rgba(255,255,255,0.035); }
.comparison-table { width: 100%; min-width: 880px; border-collapse: collapse; }
.comparison-table th, .comparison-table td { padding: 18px; text-align: left; border-bottom: 1px solid rgba(255,255,255,0.09); }
.comparison-table th { color: #8fa3ba; font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; }
.comparison-table td { color: #c1ccda; font-size: 0.82rem; }
.comparison-table td strong { color: white; }
.comparison-table tr:last-child td { border-bottom: 0; }
.comparison-table tbody tr { transition: background 0.18s; }
.comparison-table tbody tr:hover { background: rgba(255,255,255,0.045); }
.comparison-table tr.is-hidden { display: none; }
.category-pill { display: block; width: max-content; margin-bottom: 4px; color: #7ccfff; font-size: 0.58rem; letter-spacing: 0.1em; text-transform: uppercase; }
.tiny-provider { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 7px; }
.aws-dot { background: var(--aws); box-shadow: 0 0 10px var(--aws); }
.azure-dot { background: var(--azure); box-shadow: 0 0 10px var(--azure); }

.provider-tabs { margin-top: 55px; }
.tab-list { display: flex; gap: 10px; margin-bottom: 23px; }
.tab-button { border-radius: 13px; padding: 12px 18px; }
.tab-button.active { color: #07111f; background: white; border-color: white; }
.tab-panel { animation: fade-in 0.25s ease; }
.service-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.service-card { display: flex; flex-direction: column; min-height: 230px; padding: 22px; border: 1px solid rgba(255,255,255,0.12); background: rgba(255,255,255,0.045); border-radius: 18px; transition: transform 0.25s, border-color 0.25s, background 0.25s; }
.service-card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.28); background: rgba(255,255,255,0.075); }
.service-code { width: 45px; height: 45px; border-radius: 13px; display: grid; place-items: center; font-weight: 900; font-size: 0.72rem; }
.aws-service { background: rgba(255,153,0,0.14); color: #ffb33e; border: 1px solid rgba(255,153,0,0.24); }
.azure-service { background: rgba(22,139,210,0.16); color: #62c4ff; border: 1px solid rgba(22,139,210,0.3); }
.service-card h3 { margin: 20px 0 8px; font-size: 1rem; color: white; }
.service-card p { margin: 0 0 18px; color: #aebed0; font-size: 0.8rem; }
.service-card a { margin-top: auto; color: #70cbff; font-size: 0.74rem; font-weight: 800; text-decoration: none; }

.architecture-switch { display: inline-flex; flex-wrap: wrap; gap: 8px; padding: 6px; border: 1px solid var(--line); background: var(--surface); border-radius: 16px; margin-bottom: 25px; }
.architecture-button { border: none; color: var(--muted); background: transparent; border-radius: 11px; padding: 11px 16px; }
.architecture-button.active { background: var(--text); color: var(--bg); }
.architecture-panel { padding: 36px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-sm); animation: fade-in 0.25s ease; }
.architecture-heading { display: flex; justify-content: space-between; gap: 30px; align-items: end; margin-bottom: 30px; }
.architecture-heading h3 { margin: 7px 0 0; font-size: clamp(1.5rem, 3vw, 2.35rem); letter-spacing: -0.035em; }
.architecture-heading > p { max-width: 450px; color: var(--muted); margin: 0; font-size: 0.88rem; }
.dual-architecture { display: grid; grid-template-columns: 1fr 1fr; gap: 17px; }
.architecture-provider { padding: 22px; border-radius: 20px; border: 1px solid var(--line); background: var(--bg); }
.aws-architecture { box-shadow: inset 0 3px 0 var(--aws); }
.azure-architecture { box-shadow: inset 0 3px 0 var(--azure); }
.architecture-provider-title { display: flex; align-items: center; gap: 11px; margin-bottom: 22px; }
.flow-diagram { display: flex; align-items: center; justify-content: center; gap: 9px; }
.flow-diagram i { color: var(--muted); font-style: normal; }
.flow-node { min-width: 90px; min-height: 105px; padding: 13px 8px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; border: 1px solid var(--line); background: var(--surface); border-radius: 15px; box-shadow: var(--shadow-sm); }
.flow-node > span { min-height: 28px; display: grid; place-items: center; font-size: 0.72rem; font-weight: 900; color: var(--azure); }
.aws-architecture .flow-node > span { color: #d77c00; }
.flow-node strong { font-size: 0.71rem; }
.flow-node small { color: var(--muted); font-size: 0.58rem; margin-top: 4px; }
.support-services { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 15px; }
.support-services span { padding: 6px 8px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); border-radius: 99px; font-size: 0.63rem; }
.architecture-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 23px; }
.architecture-notes div { padding: 17px; border-radius: 14px; background: var(--surface-alt); }
.architecture-notes strong, .architecture-notes span { display: block; }
.architecture-notes strong { font-size: 0.78rem; }
.architecture-notes span { margin-top: 3px; color: var(--muted); font-size: 0.7rem; }

.warning-card { display: flex; gap: 16px; align-items: flex-start; padding: 22px; margin-bottom: 24px; border: 1px solid color-mix(in srgb, var(--warning) 45%, var(--line)); border-radius: 17px; background: color-mix(in srgb, var(--warning) 9%, var(--surface)); }
.warning-icon { width: 35px; height: 35px; display: grid; place-items: center; flex-shrink: 0; border-radius: 50%; color: #7b4600; background: #ffd37d; font-weight: 900; }
.warning-card strong { font-size: 0.95rem; }
.warning-card p { margin: 3px 0 0; color: var(--muted); font-size: 0.8rem; }
.practice-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.practice-card { padding: 30px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.practice-header { display: flex; align-items: center; gap: 14px; }
.practice-header h3 { margin: 0; font-size: 1.25rem; }
.practice-header p { margin: 1px 0 0; color: var(--muted); font-size: 0.75rem; }
.practice-list { list-style: none; padding: 0; margin: 27px 0; display: grid; gap: 16px; }
.practice-list li { display: flex; align-items: flex-start; gap: 12px; }
.practice-list li > span { width: 26px; height: 26px; display: grid; place-items: center; flex-shrink: 0; border-radius: 9px; background: var(--surface-alt); color: var(--azure); font-weight: 900; font-size: 0.7rem; }
.practice-list strong { display: block; font-size: 0.84rem; }
.practice-list p { margin: 2px 0 0; color: var(--muted); font-size: 0.73rem; }
.code-block { overflow: hidden; border-radius: 15px; background: #07111f; color: #d8e6f7; border: 1px solid #223247; }
.code-header { display: flex; justify-content: space-between; align-items: center; padding: 10px 13px; color: #8da3ba; border-bottom: 1px solid #223247; font-size: 0.66rem; }
.copy-button { border: 1px solid #2f435c; color: #b9cce0; background: #101f32; border-radius: 7px; padding: 4px 8px; cursor: pointer; font-size: 0.62rem; }
.code-block pre { margin: 0; padding: 17px; overflow-x: auto; font-size: 0.73rem; line-height: 1.8; }
.practice-links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 17px; }
.practice-links a { color: var(--azure); font-size: 0.72rem; font-weight: 800; text-decoration: none; }
.mini-projects { margin-top: 48px; }
.project-list { margin-top: 24px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; }
.project-list article { min-height: 210px; padding: 23px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow-sm); }
.project-level { color: var(--azure); font-size: 0.62rem; font-weight: 900; letter-spacing: 0.1em; text-transform: uppercase; }
.project-list h4 { margin: 17px 0 8px; }
.project-list p { margin: 0; color: var(--muted); font-size: 0.78rem; }
.project-list small { display: block; margin-top: 16px; padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.65rem; }

.progress-card { padding: 22px 25px; margin-bottom: 25px; border: 1px solid var(--line); background: var(--surface); border-radius: 18px; box-shadow: var(--shadow-sm); }
.progress-info { display: flex; align-items: end; justify-content: space-between; margin-bottom: 14px; }
.progress-info > div { display: grid; gap: 3px; }
.progress-info strong { font-size: 0.9rem; }
.progress-info > span { color: var(--azure); font-weight: 900; font-size: 1.15rem; }
.progress-track { height: 9px; overflow: hidden; border-radius: 99px; background: var(--surface-alt); }
.progress-bar { width: 0%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--aws), var(--azure), var(--purple)); transition: width 0.3s ease; }
.roadmap-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.week-card { padding: 23px; border: 1px solid var(--line); background: var(--surface); border-radius: 20px; box-shadow: var(--shadow-sm); }
.week-header { display: flex; justify-content: space-between; gap: 12px; align-items: center; padding-bottom: 15px; border-bottom: 1px solid var(--line); margin-bottom: 13px; }
.week-header span { color: var(--azure); font-size: 0.65rem; font-weight: 900; letter-spacing: 0.1em; text-transform: uppercase; }
.week-header strong { font-size: 0.82rem; }
.task { position: relative; display: flex; align-items: flex-start; gap: 10px; padding: 10px 0; color: var(--muted); font-size: 0.73rem; cursor: pointer; }
.task input { appearance: none; width: 18px; height: 18px; margin: 1px 0 0; flex-shrink: 0; border-radius: 6px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; }
.task input:checked { background: linear-gradient(135deg, var(--azure), var(--purple)); border-color: transparent; }
.task input:checked::after { content: "✓"; display: grid; place-items: center; color: white; font-size: 11px; font-weight: 900; }
.task:has(input:checked) span { text-decoration: line-through; opacity: 0.65; }

.quiz-container { max-width: 900px; }
.quiz-card { min-height: 480px; padding: 34px; border-radius: var(--radius-lg); background: rgba(255,255,255,0.055); border: 1px solid rgba(255,255,255,0.13); }
.quiz-topline { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 32px; color: #9fb0c4; font-size: 0.72rem; font-weight: 800; }
.quiz-dots { display: flex; gap: 5px; }
.quiz-dots span { width: 19px; height: 4px; border-radius: 99px; background: rgba(255,255,255,0.16); }
.quiz-dots span.active { background: var(--azure); }
.quiz-dots span.answered { background: var(--aws); }
.quiz-question h3 { color: white; font-size: clamp(1.3rem, 2.8vw, 1.85rem); line-height: 1.25; margin: 0 0 26px; }
.quiz-options { display: grid; gap: 10px; }
.quiz-option { width: 100%; display: flex; align-items: center; gap: 12px; padding: 15px 17px; text-align: left; color: #c1cddd; background: rgba(255,255,255,0.045); border: 1px solid rgba(255,255,255,0.12); border-radius: 14px; cursor: pointer; transition: 0.2s; }
.quiz-option:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.25); }
.quiz-option.selected { border-color: #54bdf8; background: rgba(22,139,210,0.16); color: white; }
.option-letter { width: 29px; height: 29px; display: grid; place-items: center; flex-shrink: 0; border-radius: 9px; border: 1px solid rgba(255,255,255,0.18); font-size: 0.7rem; font-weight: 900; }
.quiz-actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 32px; }
.quiz-actions button:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.quiz-result { text-align: center; color: white; padding: 10px 0 0; }
.result-ring { width: 140px; height: 140px; margin: 0 auto 22px; display: grid; place-items: center; border-radius: 50%; background: conic-gradient(var(--azure) var(--score-angle), rgba(255,255,255,0.12) 0); position: relative; }
.result-ring::before { content: ""; position: absolute; inset: 10px; border-radius: 50%; background: #0c192a; }
.result-ring span { position: relative; z-index: 1; font-size: 2rem; font-weight: 900; }
.quiz-result h3 { margin: 0 0 7px; font-size: 1.7rem; }
.quiz-result > p { color: #aab9ca; max-width: 570px; margin: 0 auto 25px; }
.result-review { display: grid; gap: 8px; margin-top: 22px; text-align: left; }
.result-item { padding: 13px 15px; border-radius: 12px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); }
.result-item.correct { border-left: 3px solid var(--success); }
.result-item.incorrect { border-left: 3px solid var(--danger); }
.result-item strong { display: block; font-size: 0.75rem; }
.result-item p { margin: 4px 0 0; color: #aab9ca; font-size: 0.67rem; }

.glossary-search { max-width: 630px; height: 55px; display: flex; align-items: center; gap: 10px; padding: 0 17px; margin-bottom: 25px; border: 1px solid var(--line); background: var(--surface); border-radius: 15px; box-shadow: var(--shadow-sm); }
.glossary-search span { color: var(--muted); font-size: 22px; }
.glossary-search input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--text); }
.glossary-search input::placeholder { color: var(--muted); }
.glossary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.glossary-item { padding: 21px; border: 1px solid var(--line); background: var(--surface); border-radius: 17px; box-shadow: var(--shadow-sm); }
.glossary-item strong { font-size: 0.9rem; }
.glossary-item p { color: var(--muted); font-size: 0.74rem; margin: 6px 0 0; }
.glossary-item.is-hidden { display: none; }
.empty-state { padding: 30px; text-align: center; color: var(--muted); }

.resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.resource-card { min-height: 115px; display: grid; grid-template-columns: 60px 1fr auto; align-items: center; gap: 16px; padding: 21px; border-radius: 18px; border: 1px solid var(--line); background: var(--surface); text-decoration: none; box-shadow: var(--shadow-sm); transition: transform 0.25s, border-color 0.25s; }
.resource-card:hover { transform: translateY(-4px); }
.resource-card > span { width: 55px; height: 55px; display: grid; place-items: center; border-radius: 15px; font-size: 0.65rem; font-weight: 900; letter-spacing: 0.05em; }
.aws-resource > span { background: var(--aws-soft); color: #cc7100; }
.azure-resource > span { background: var(--azure-soft); color: #0573b4; }
.neutral-resource > span { background: color-mix(in srgb, var(--purple) 13%, var(--surface)); color: var(--purple); }
.resource-card strong { display: block; font-size: 0.94rem; }
.resource-card p { margin: 3px 0 0; color: var(--muted); font-size: 0.72rem; }
.resource-card i { font-style: normal; color: var(--muted); }

.publish-section { padding-top: 55px; }
.publish-card { padding: 45px; display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 40px; align-items: center; border-radius: var(--radius-lg); background: linear-gradient(135deg, #0b213a, #123f62); color: white; box-shadow: var(--shadow-lg); }
.publish-card h2 { margin: 9px 0 11px; font-size: clamp(1.8rem, 3vw, 2.7rem); line-height: 1.05; letter-spacing: -0.04em; }
.publish-card > div:first-child p { color: #b7c9da; margin: 0; }
.publish-card code { padding: 3px 6px; border-radius: 6px; background: rgba(255,255,255,0.1); color: #9fdbff; }
.publish-steps { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.publish-steps div { min-height: 105px; padding: 17px; border: 1px solid rgba(255,255,255,0.13); background: rgba(255,255,255,0.06); border-radius: 15px; }
.publish-steps span { width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; background: rgba(255,255,255,0.11); color: #81d2ff; font-weight: 900; font-size: 0.7rem; }
.publish-steps p { margin: 12px 0 0; color: #c2d0df; font-size: 0.75rem; }

.site-footer { padding: 40px 0; border-top: 1px solid var(--line); background: var(--surface); }
.footer-content { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 35px; }
.footer-content > p { color: var(--muted); font-size: 0.72rem; text-align: center; }
.footer-content > a { color: var(--azure); font-size: 0.75rem; font-weight: 850; text-decoration: none; }
.footer-brand .brand-mark { width: 36px; height: 36px; border-radius: 11px; }
.footer-brand .brand-cloud { font-size: 20px; }

.toast { position: fixed; left: 50%; bottom: 25px; z-index: 2000; transform: translate(-50%, 25px); padding: 10px 15px; background: #07111f; color: white; border: 1px solid #273a52; border-radius: 10px; box-shadow: var(--shadow-lg); font-size: 0.73rem; opacity: 0; pointer-events: none; transition: 0.25s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.65s ease, transform 0.65s ease; }
.reveal.visible { opacity: 1; transform: none; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes spin-reverse { to { transform: rotate(-360deg); } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes fade-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 1050px) {
  .hero-grid { gap: 35px; }
  .hero-visual { min-height: 470px; transform: scale(0.9); }
  .learning-steps, .concept-grid, .roadmap-grid { grid-template-columns: repeat(2, 1fr); }
  .service-cards { grid-template-columns: repeat(3, 1fr); }
  .project-list { grid-template-columns: repeat(2, 1fr); }
  .flow-node { min-width: 75px; }
}

@media (max-width: 850px) {
  :root { --header-height: 70px; }
  .section { padding: 82px 0; }
  .menu-toggle { display: grid; margin-left: auto; }
  .nav { gap: 12px; }
  .nav-links { position: fixed; inset: var(--header-height) 0 auto 0; min-height: calc(100vh - var(--header-height)); display: flex; flex-direction: column; align-items: stretch; gap: 0; padding: 25px 20px; background: var(--bg); border-top: 1px solid var(--line); transform: translateX(100%); transition: transform 0.25s; }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { padding: 16px 4px; border-bottom: 1px solid var(--line); font-size: 1rem; }
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { text-align: center; }
  .hero-description { margin-inline: auto; }
  .hero-actions, .hero-highlights { justify-content: center; }
  .hero-visual { min-height: 480px; max-width: 620px; width: 100%; margin: -30px auto 0; }
  .service-models, .responsibility, .publish-card { grid-template-columns: 1fr; }
  .dual-architecture, .practice-grid, .region-compare { grid-template-columns: 1fr; }
  .architecture-heading { align-items: flex-start; flex-direction: column; }
  .resource-grid { grid-template-columns: 1fr; }
  .glossary-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .section { padding: 70px 0; }
  .brand small { display: none; }
  .hero { padding-top: 62px; }
  .hero h1 { font-size: clamp(2.6rem, 14vw, 4rem); }
  .hero-actions { display: grid; }
  .hero-highlights { gap: 18px; }
  .hero-highlights div { min-width: 80px; }
  .hero-visual { min-height: 420px; transform: scale(0.76); margin: -50px -12% -40px; width: 124%; }
  .learning-steps, .concept-grid, .roadmap-grid, .glossary-grid, .project-list { grid-template-columns: 1fr; }
  .service-models, .responsibility, .architecture-panel, .practice-card, .publish-card { padding: 25px; }
  .model-row { grid-template-columns: 1fr; gap: 5px; }
  .control-tag { width: max-content; }
  .responsibility-columns { grid-template-columns: 1fr; }
  .zones { grid-template-columns: 1fr; }
  .service-cards { grid-template-columns: 1fr; }
  .architecture-switch { width: 100%; display: grid; }
  .architecture-button { width: 100%; }
  .flow-diagram { flex-direction: column; }
  .flow-diagram i { transform: rotate(90deg); }
  .flow-node { width: 100%; min-height: 85px; }
  .architecture-notes { grid-template-columns: 1fr; }
  .publish-steps { grid-template-columns: 1fr; }
  .footer-content { grid-template-columns: 1fr; text-align: center; }
  .footer-brand { justify-content: center; }
  .quiz-card { padding: 22px; }
  .quiz-dots { display: none; }
}