/* ==========================================================================
   SigmaSkill Academy — Design System
   Direction: technical/blueprint engineering identity. Navy + steel blue,
   amber "safety" accent (industrial signage), dimension-line motifs borrowed
   from engineering drawings. DMAIC-style numbered sequences are used only
   where the content is genuinely a process (course pipeline, steps).
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root {
  /* Color tokens */
  --navy-950: #081525;
  --navy-900: #0B1E36;
  --navy-800: #0F2A4A;
  --steel-600: #235C94;
  --steel-500: #2E74B6;
  --amber-500: #F2A93B;
  --amber-600: #DB8F1F;
  --paper: #F5F8FC;
  --paper-dim: #EBF0F7;
  --ink-900: #0E1A2B;
  --slate-600: #4C5C71;
  --slate-400: #8496AC;
  --line: #DCE4EF;
  --line-dark: #22374F;
  --success: #1C8A5C;
  --success-bg: #E5F5EC;
  --warning: #B8790A;
  --warning-bg: #FCF1DD;
  --danger: #C4372F;
  --danger-bg: #FBEAE8;
  --white: #FFFFFF;

  /* Type */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  /* Layout */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(8, 21, 37, 0.08);
  --shadow-md: 0 8px 24px rgba(8, 21, 37, 0.10);
  --shadow-lg: 0 20px 48px rgba(8, 21, 37, 0.16);
  --container-w: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink-900);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  color: var(--navy-900);
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.1rem, 4vw, 3.2rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); font-weight: 700; }
h3 { font-size: 1.3rem; font-weight: 600; }
p { margin: 0 0 1em; color: var(--slate-600); }
a { color: var(--steel-500); text-decoration: none; }
a:hover { color: var(--steel-600); }

.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section--tight { padding: 56px 0; }
.section--navy { background: var(--navy-950); color: var(--paper); }
.section--navy h2, .section--navy h3 { color: var(--white); }
.section--navy p { color: #B9C6D8; }
.section--dim { background: var(--paper-dim); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-600);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 2px;
  background: var(--amber-500);
  display: inline-block;
}
.section--navy .eyebrow { color: var(--amber-500); }

.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease, border-color .15s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--amber-500); color: var(--navy-950); }
.btn-primary:hover { background: var(--amber-600); color: var(--navy-950); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: var(--white); border-color: rgba(255,255,255,0.35); }
.btn-outline:hover { border-color: var(--white); color: var(--white); background: rgba(255,255,255,0.06); }
.btn-outline-navy { background: transparent; color: var(--navy-900); border-color: var(--line-dark); border-color: var(--navy-800); }
.btn-outline-navy:hover { background: var(--navy-900); color: var(--white); }
.btn-secondary { background: var(--navy-900); color: var(--white); }
.btn-secondary:hover { background: var(--navy-800); color: var(--white); transform: translateY(-1px); }
.btn-sm { padding: 8px 16px; font-size: 0.82rem; }
.btn-block { width: 100%; }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #A82A23; color: var(--white); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* Navbar */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8, 21, 37, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-dark);
}
.navbar-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; max-width: var(--container-w); margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--white); font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 6px;
  background: linear-gradient(145deg, var(--amber-500), var(--amber-600));
  display: flex; align-items: center; justify-content: center;
  color: var(--navy-950); font-family: var(--font-mono); font-weight: 700; font-size: 0.95rem;
}
.brand-sub { display: block; font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.1em; color: var(--amber-500); font-weight: 500; }

.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  color: #C9D5E4; font-weight: 500; font-size: 0.92rem; padding: 8px 14px; border-radius: var(--radius-sm);
}
.nav-links a:hover, .nav-links a.active { color: var(--white); background: rgba(255,255,255,0.06); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: none; color: var(--white); font-size: 1.5rem; cursor: pointer; }

@media (max-width: 900px) {
  .nav-links { position: fixed; top: 64px; left: 0; right: 0; background: var(--navy-950); flex-direction: column; align-items: stretch; padding: 10px 20px 20px; gap: 2px; border-bottom: 1px solid var(--line-dark); transform: translateY(-130%); opacity: 0; transition: all 0.2s ease; pointer-events: none; }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 12px 8px; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-toggle { display: block; }
  .nav-cta .btn-outline { display: none; }
}

/* Hero */
.hero { position: relative; background: var(--navy-950); color: var(--white); overflow: hidden; padding: 110px 0 90px; }
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(46, 116, 182, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 116, 182, 0.16) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 80% 60% at 70% 30%, black 10%, transparent 75%);
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { color: var(--white); }
.hero .lead { color: #B9C6D8; font-size: 1.12rem; max-width: 520px; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 32px; margin-top: 48px; flex-wrap: wrap; }
.hero-stat .num { font-family: var(--font-mono); font-size: 1.7rem; font-weight: 600; color: var(--amber-500); }
.hero-stat .label { font-size: 0.78rem; color: var(--slate-400); text-transform: uppercase; letter-spacing: 0.06em; }

.blueprint-card {
  position: relative; background: rgba(15, 42, 74, 0.55); border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg); padding: 28px; backdrop-filter: blur(6px);
}
.blueprint-card::before, .blueprint-card::after {
  content: ''; position: absolute; width: 22px; height: 22px; border: 2px solid var(--amber-500); opacity: 0.7;
}
.blueprint-card::before { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.blueprint-card::after { bottom: -1px; right: -1px; border-left: none; border-top: none; }
.blueprint-card .dim-label { font-family: var(--font-mono); font-size: 0.7rem; color: var(--amber-500); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px; }
.blueprint-row { display: flex; justify-content: space-between; padding: 11px 0; border-bottom: 1px dashed rgba(255,255,255,0.12); font-size: 0.9rem; }
.blueprint-row:last-child { border-bottom: none; }
.blueprint-row span:first-child { color: #92A3B9; }
.blueprint-row span:last-child { color: var(--white); font-family: var(--font-mono); font-weight: 500; }

/* Grids & Cards */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: 26px; transition: transform 0.18s ease, box-shadow 0.18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--steel-500); }

.course-card { display: flex; flex-direction: column; height: 100%; }
.course-card .tag {
  align-self: flex-start; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.06em;
  text-transform: uppercase; background: var(--paper-dim); color: var(--steel-600); padding: 4px 10px; border-radius: 20px; margin-bottom: 14px; font-weight: 600;
}
.course-card h3 { margin-bottom: 8px; }
.course-card .meta { display: flex; gap: 14px; margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.82rem; color: var(--slate-400); font-family: var(--font-mono); }
.course-card .fee { font-family: var(--font-mono); font-weight: 600; color: var(--navy-900); font-size: 1.05rem; }

.process-step { display: flex; gap: 18px; }
.process-num { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600; color: var(--amber-600); border: 1.5px solid var(--amber-500); border-radius: 50%; width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

.stat-card { text-align: center; padding: 30px 20px; }
.stat-card .num { font-family: var(--font-mono); font-size: 2.2rem; font-weight: 600; color: var(--navy-900); }
.stat-card .label { color: var(--slate-400); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; }

.testimonial-card { background: var(--white); border-left: 3px solid var(--amber-500); padding: 24px; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.testimonial-card .quote { font-style: normal; color: var(--ink-900); }
.testimonial-card .who { margin-top: 14px; font-size: 0.85rem; color: var(--slate-400); font-family: var(--font-mono); }

/* Badges */
.badge { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600; padding: 4px 10px; border-radius: 20px; text-transform: uppercase; letter-spacing: 0.04em; }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-neutral { background: var(--paper-dim); color: var(--slate-600); }

/* Forms */
.form-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-sm); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; font-size: 0.85rem; margin-bottom: 7px; color: var(--navy-900); }
.form-control {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  font-family: var(--font-body); font-size: 0.95rem; background: var(--paper); color: var(--ink-900); transition: border-color .15s ease;
}
.form-control:focus { outline: none; border-color: var(--steel-500); background: var(--white); }
textarea.form-control { resize: vertical; min-height: 110px; }
.form-hint { font-size: 0.78rem; color: var(--slate-400); margin-top: 5px; }
.form-error { font-size: 0.8rem; color: var(--danger); margin-top: 5px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 620px) { .form-row { grid-template-columns: 1fr; } }

/* Tables (admin) */
.table-wrap { overflow-x: auto; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-md); }
table.data-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
table.data-table th { text-align: left; padding: 13px 16px; background: var(--paper-dim); color: var(--slate-600); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; font-family: var(--font-mono); border-bottom: 1px solid var(--line); }
table.data-table td { padding: 13px 16px; border-bottom: 1px solid var(--line); color: var(--ink-900); vertical-align: middle; }
table.data-table tr:last-child td { border-bottom: none; }
table.data-table tr:hover td { background: var(--paper); }
.mono { font-family: var(--font-mono); }

/* Admin shell */
.admin-shell { display: grid; grid-template-columns: 250px 1fr; min-height: calc(100vh - 60px); }
.admin-sidebar { background: var(--navy-950); color: var(--white); padding: 26px 16px; }
.admin-sidebar .side-title { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--slate-400); padding: 10px 12px 6px; }
.admin-sidebar a { display: block; padding: 10px 12px; border-radius: var(--radius-sm); color: #C9D5E4; font-size: 0.9rem; font-weight: 500; margin-bottom: 2px; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: rgba(255,255,255,0.07); color: var(--white); }
.admin-main { padding: 32px; background: var(--paper); }
.admin-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 26px; flex-wrap: wrap; gap: 12px; }
@media (max-width: 900px) { .admin-shell { grid-template-columns: 1fr; } .admin-sidebar { display: flex; overflow-x: auto; gap: 4px; padding: 12px; } .admin-sidebar .side-title { display: none; } }

/* Footer */
.footer { background: var(--navy-950); color: #92A3B9; padding: 64px 0 28px; }
.footer h4 { color: var(--white); font-size: 0.95rem; margin-bottom: 16px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 32px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer a { color: #92A3B9; display: block; padding: 4px 0; font-size: 0.9rem; }
.footer a:hover { color: var(--amber-500); }
.footer-bottom { border-top: 1px solid var(--line-dark); margin-top: 40px; padding-top: 22px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 0.82rem; }

/* Flash messages */
.flash-stack { position: fixed; top: 78px; right: 20px; z-index: 200; display: flex; flex-direction: column; gap: 10px; max-width: 360px; }
.flash { padding: 14px 18px; border-radius: var(--radius-sm); font-size: 0.9rem; box-shadow: var(--shadow-md); border-left: 4px solid; }
.flash-success { background: var(--success-bg); color: var(--success); border-color: var(--success); }
.flash-danger { background: var(--danger-bg); color: var(--danger); border-color: var(--danger); }
.flash-warning { background: var(--warning-bg); color: var(--warning); border-color: var(--warning); }
.flash-info { background: #E7F0FA; color: var(--steel-600); border-color: var(--steel-500); }

/* WhatsApp float button */
.whatsapp-float {
  position: fixed; bottom: 24px; right: 24px; z-index: 150;
  width: 56px; height: 56px; border-radius: 50%; background: #25D366; color: white;
  display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-lg);
  font-size: 1.6rem;
}
.whatsapp-float:hover { transform: scale(1.06); color: white; }

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.muted { color: var(--slate-400); }
.divider { height: 1px; background: var(--line); margin: 28px 0; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--slate-400); }
.empty-state h3 { color: var(--navy-900); }