/* IDEAI landing — ideai.songlotech.vn */

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

:root {
  --bg-deep: #06080f;
  --bg: #0a0e17;
  --bg-elevated: #111827;
  --bg-card: rgba(17, 24, 39, 0.72);
  --border: rgba(148, 163, 184, 0.12);
  --border-strong: rgba(79, 195, 247, 0.35);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #4fc3f7;
  --accent-2: #818cf8;
  --accent-hover: #29b6f6;
  --success: #34d399;
  --radius: 14px;
  --radius-sm: 10px;
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --header-h: 72px;
  --container: min(1140px, 92vw);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-deep);
  overflow-x: hidden;
}

.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(79, 195, 247, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(129, 140, 248, 0.14), transparent 50%),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(52, 211, 153, 0.08), transparent 45%),
    var(--bg-deep);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black, transparent 75%);
}

.container {
  width: var(--container);
  margin-inline: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

code,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}

code {
  padding: 0.12em 0.4em;
  border-radius: 6px;
  background: rgba(79, 195, 247, 0.1);
  border: 1px solid rgba(79, 195, 247, 0.2);
}

kbd {
  padding: 0.15em 0.45em;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 0.8em;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  backdrop-filter: blur(16px) saturate(1.2);
  background: rgba(6, 8, 15, 0.75);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 24px rgba(79, 195, 247, 0.45);
}

.logo-text {
  font-size: 1.15rem;
  background: linear-gradient(90deg, var(--text), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  display: flex;
  gap: 1.5rem;
  margin-left: auto;
}

.nav a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--text);
}

.header-cta {
  display: flex;
  gap: 0.5rem;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--text);
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 0.15s,
    box-shadow 0.2s,
    background 0.2s,
    border-color 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.85rem 1.35rem;
  font-size: 1rem;
}

.btn-primary {
  color: #041018;
  background: linear-gradient(135deg, var(--accent), #38bdf8);
  box-shadow: 0 8px 32px rgba(79, 195, 247, 0.35);
}

.btn-primary:hover {
  color: #041018;
  box-shadow: 0 12px 40px rgba(79, 195, 247, 0.5);
}

.btn-outline {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(79, 195, 247, 0.06);
}

.btn-outline:hover {
  color: var(--accent);
  background: rgba(79, 195, 247, 0.12);
}

.btn-ghost {
  color: var(--text-muted);
  background: transparent;
  border-color: var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* Hero */
.hero {
  padding: clamp(3rem, 8vw, 5.5rem) 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow-muted {
  color: var(--text-muted);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  70% {
    box-shadow: 0 0 0 10px rgba(52, 211, 153, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0);
  }
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2.1rem, 4.5vw, 3.35rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.gradient-text {
  display: block;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 32rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.hero-stats strong {
  font-size: 0.95rem;
}

.hero-stats span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* IDE mockup */
.hero-visual {
  position: relative;
}

.hero-glow {
  position: absolute;
  inset: 10% -5% -10%;
  background: radial-gradient(circle, rgba(79, 195, 247, 0.25), transparent 65%);
  filter: blur(40px);
  z-index: -1;
}

.ide-window {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #0d1117;
  box-shadow: var(--shadow);
  transform: perspective(1200px) rotateY(-4deg) rotateX(2deg);
  transition: transform 0.5s ease;
}

.ide-window:hover {
  transform: perspective(1200px) rotateY(-1deg) rotateX(0deg);
}

.ide-titlebar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.85rem;
  background: #161b22;
  border-bottom: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.traffic {
  display: flex;
  gap: 5px;
}

.traffic i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #484f58;
}

.traffic i:first-child {
  background: #ff5f57;
}
.traffic i:nth-child(2) {
  background: #febc2e;
}
.traffic i:nth-child(3) {
  background: #28c840;
}

.ide-title {
  flex: 1;
}

.ide-badge {
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-size: 0.65rem;
  color: var(--accent);
  background: rgba(79, 195, 247, 0.12);
  border: 1px solid rgba(79, 195, 247, 0.3);
}

.ide-body {
  display: grid;
  grid-template-columns: 88px 1fr 120px;
  min-height: 220px;
  font-size: 0.65rem;
}

.ide-sidebar {
  padding: 0.5rem;
  border-right: 1px solid var(--border);
  background: #0d1117;
}

.ide-tree-label {
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  font-weight: 600;
}

.ide-tree {
  margin: 0;
  padding: 0;
  list-style: none;
  color: #8b949e;
  line-height: 1.5;
}

.ide-tree .indent {
  padding-left: 0.6rem;
}
.ide-tree .indent2 {
  padding-left: 1.2rem;
}
.ide-tree .active {
  color: var(--accent);
}

.ide-editor {
  border-right: 1px solid var(--border);
}

.ide-tabs {
  display: flex;
  gap: 1px;
  background: #161b22;
  border-bottom: 1px solid var(--border);
}

.ide-tabs span {
  padding: 0.35rem 0.6rem;
  background: #0d1117;
  color: var(--text-muted);
}

.ide-tabs span.on {
  color: var(--text);
  border-top: 2px solid var(--accent);
}

.ide-code {
  margin: 0;
  padding: 0.65rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  line-height: 1.55;
  color: #c9d1d9;
  overflow: hidden;
}

.ide-code .kw {
  color: #ff7b72;
}
.ide-code .fn {
  color: #d2a8ff;
}
.ide-code .bool {
  color: #79c0ff;
}
.ide-code .tag {
  color: #7ee787;
}
.ide-code .cm {
  color: #8b949e;
}

.ide-chat {
  padding: 0.45rem;
  background: #0d1117;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chat-head {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.68rem;
}

.chat-msg {
  padding: 0.35rem;
  border-radius: 6px;
  font-size: 0.58rem;
  line-height: 1.4;
}

.chat-msg.user {
  background: rgba(79, 195, 247, 0.12);
  color: var(--text);
}

.chat-msg.ai {
  background: rgba(129, 140, 248, 0.12);
  color: var(--text-muted);
}

.chat-input {
  margin-top: auto;
  padding: 0.35rem;
  border-radius: 6px;
  border: 1px dashed var(--border);
  color: #484f58;
  font-size: 0.58rem;
}

.ide-status {
  display: flex;
  gap: 1rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.62rem;
  color: var(--text-muted);
  background: #161b22;
  border-top: 1px solid var(--border);
}

.ide-status .ok {
  margin-left: auto;
  color: var(--success);
}

/* Logos band */
.logos-band {
  padding: 1.5rem 0;
  border-block: 1px solid var(--border);
  background: rgba(17, 24, 39, 0.4);
}

.logos-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 2rem;
}

.logos-inner span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Sections */
.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section-alt {
  background: rgba(17, 24, 39, 0.35);
  border-block: 1px solid var(--border);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

.section-head h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
}

.section-lead {
  margin: 0;
  color: var(--text-muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  transition:
    border-color 0.25s,
    transform 0.25s,
    box-shadow 0.25s;
}

.feature-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.25);
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  border-radius: 12px;
  font-size: 1.25rem;
  background: linear-gradient(135deg, rgba(79, 195, 247, 0.2), rgba(129, 140, 248, 0.15));
  border: 1px solid rgba(79, 195, 247, 0.25);
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Workflow */
.workflow-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.workflow-copy h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
}

.workflow-copy > p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.steps li {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-muted);
}

.steps span {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent);
  background: rgba(79, 195, 247, 0.12);
  border: 1px solid rgba(79, 195, 247, 0.25);
}

.workflow-panel {
  padding: 1.75rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.dag-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.dag-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.dag-node {
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.dag-node.root {
  color: var(--text);
  border-color: var(--border-strong);
}

.dag-node.accent {
  color: var(--accent);
  border-color: rgba(79, 195, 247, 0.4);
  background: rgba(79, 195, 247, 0.08);
}

.workflow-note {
  margin: 1.25rem 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

/* Platforms */
.provider-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.provider-row span {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
}

.platform-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.platform-card {
  padding: 1.35rem;
  border-radius: var(--radius);
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.platform-card h3 {
  margin: 0 0 0.35rem;
}

.platform-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* CTA */
.cta-section {
  padding-bottom: 4rem;
}

.cta-box {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(145deg, rgba(79, 195, 247, 0.12), rgba(129, 140, 248, 0.08));
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow);
}

.cta-content h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}

.cta-content > p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.cta-hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.cta-shortcuts h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.cta-shortcuts ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: rgba(6, 8, 15, 0.9);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem 2rem;
  align-items: start;
}

.footer-brand p {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  grid-column: 1 / -1;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-copy {
  margin: 0;
  grid-column: 1 / -1;
  font-size: 0.8rem;
  color: #64748b;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 960px) {
  .hero-grid,
  .workflow-grid,
  .cta-box {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .platform-cards {
    grid-template-columns: 1fr 1fr;
  }

  .ide-window {
    transform: none;
  }

  .nav,
  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  body.nav-open .nav {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    padding: 1rem 4vw 1.5rem;
    background: rgba(6, 8, 15, 0.98);
    border-bottom: 1px solid var(--border);
    margin-left: 0;
  }

  body.nav-open .header-cta {
    display: flex;
    position: fixed;
    top: calc(var(--header-h) + 180px);
    left: 4vw;
    right: 4vw;
  }
}

@media (max-width: 600px) {
  .feature-grid,
  .platform-cards {
    grid-template-columns: 1fr;
  }

  .ide-body {
    grid-template-columns: 72px 1fr;
  }

  .ide-chat {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .pulse-dot {
    animation: none;
  }
}