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

:root {
  --navy: #0d1b2a;
  --blue: #1b4f72;
  --accent: #2e86c1;
  --light: #f4f6f8;
  --text: #2c3e50;
  --muted: #7f8c8d;
  --white: #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--light);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  background: var(--navy);
  color: var(--white);
  padding: 1.2rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header .logo {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--white);
}

header .logo span {
  color: #5dade2;
}

header nav a {
  color: #aec6d8;
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.9rem;
  transition: color 0.2s;
}

header nav a:hover {
  color: var(--white);
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: var(--white);
  text-align: center;
  padding: 5rem 2rem;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.15rem;
  color: #aec6d8;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero .btn {
  background: var(--accent);
  color: var(--white);
  padding: 0.75rem 2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s;
  display: inline-block;
}

.hero .btn:hover {
  background: #1a6fa0;
}

/* ── Section ── */
.section {
  padding: 4rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.section h2 {
  font-size: 1.8rem;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.section .subtitle {
  color: var(--muted);
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

/* ── Project Cards ── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--white);
  border-radius: 10px;
  padding: 2rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.card .icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.1rem;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
  flex: 1;
}

.card .arrow {
  margin-top: 1.2rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
}

/* ── Project Page ── */
.project-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: var(--white);
  padding: 4rem 2rem;
}

.project-hero .back {
  display: inline-block;
  color: #aec6d8;
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}

.project-hero .back:hover {
  color: var(--white);
}

.project-hero h1 {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

.project-hero p {
  color: #aec6d8;
  font-size: 1.05rem;
  max-width: 600px;
}

.project-body {
  max-width: 800px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.project-body h2 {
  font-size: 1.4rem;
  color: var(--navy);
  margin: 2rem 0 0.75rem;
}

.project-body p {
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.tag {
  background: #dce8f5;
  color: var(--blue);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.coming-soon {
  background: var(--white);
  border: 2px dashed #bdc3c7;
  border-radius: 10px;
  padding: 3rem;
  text-align: center;
  color: var(--muted);
  margin-top: 2rem;
}

.coming-soon p {
  color: var(--muted);
}

/* ── Footer ── */
footer {
  background: var(--navy);
  color: #7f8c8d;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  margin-top: auto;
}