/* ============================================================
   SMS Service Project — Dark Theme Design System
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --bg-primary:    #0f1117;
  --bg-secondary:  #1a1d27;
  --bg-card:       rgba(26, 29, 39, 0.75);
  --bg-input:      #12141c;
  --text-primary:  #e2e4ea;
  --text-secondary:#9ca3af;
  --text-muted:    #6b7280;
  --accent:        #38bdf8;
  --accent-alt:    #818cf8;
  --ring:          #2a2d3a;
  --success-bg:    rgba(16, 185, 129, 0.12);
  --success-border:#10b981;
  --success-text:  #6ee7b7;
  --error-bg:      rgba(239, 68, 68, 0.12);
  --error-border:  #ef4444;
  --error-text:    #fca5a5;
  --radius:        14px;
  --radius-sm:     10px;
  --shadow-glow:   0 0 20px rgba(56, 189, 248, 0.08);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-primary);
  margin: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-alt); }

/* ---------- Layout ---------- */
header, main, footer { max-width: 860px; margin: 0 auto; padding: 1rem; }

/* ---------- Header ---------- */
header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--ring);
  padding-bottom: 1.25rem;
}
header img { width: 72px; height: 72px; margin-right: 0.75rem; }

h1 {
  font-size: 1.4rem;
  margin: 0.25rem 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
h2 {
  margin: 1.5rem 0 0.5rem;
  color: var(--text-primary);
  font-size: 1.15rem;
}
h3 { color: var(--text-secondary); font-size: 1rem; }

/* ---------- Quick Nav ---------- */
.quick-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  margin: 0 auto 0.25rem;
  max-width: 860px;
}
.quick-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 1rem;
  border: 1px solid var(--ring);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  transition: all 0.25s ease;
}
.quick-nav a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.06);
  transform: translateY(-1px);
}

/* ---------- Cards (Glassmorphism) ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--ring);
  border-radius: var(--radius);
  padding: 1.35rem;
  box-shadow: var(--shadow-glow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin: 1rem 0;
  animation: fadeSlideIn 0.5s ease both;
}

/* Stagger card animations */
.card:nth-child(1) { animation-delay: 0s; }
.card:nth-child(2) { animation-delay: 0.08s; }
.card:nth-child(3) { animation-delay: 0.16s; }
.card:nth-child(4) { animation-delay: 0.24s; }

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Kicker Badge ---------- */
.kicker {
  display: inline-block;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.82rem;
  margin-bottom: 0.4rem;
  font-weight: 500;
}

/* ---------- Identity ---------- */
.identity { font-size: 0.95rem; color: var(--text-secondary); }

/* ---------- Sample Messages ---------- */
ul.samples {
  background: rgba(56, 189, 248, 0.04);
  border: 1px dashed var(--ring);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  color: var(--text-secondary);
}
ul.samples li { margin-bottom: 0.4rem; }
ul.samples li:last-child { margin-bottom: 0; }

/* ---------- Muted Text ---------- */
.muted { color: var(--text-muted); font-size: 0.95rem; }

/* ---------- Code ---------- */
code {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  font-size: 0.92em;
}

/* ---------- Forms ---------- */
.stack { display: grid; gap: 1rem; }

label { display: block; font-weight: 600; margin: 0.5rem 0 0.25rem; color: var(--text-primary); }

input[type="text"],
input[type="tel"],
input[type="email"] {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--ring);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  outline: none;
  background: var(--bg-input);
  color: var(--text-primary);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
  font-family: inherit;
}
input[type="text"]:focus,
input[type="tel"]:focus,
input[type="email"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}
input::placeholder { color: var(--text-muted); }

/* ---------- Buttons ---------- */
button {
  margin-top: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-alt));
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  font-family: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 2px 12px rgba(56, 189, 248, 0.25);
}
button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
}
button:active:not(:disabled) { transform: translateY(0); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- Compliance Box ---------- */
.cta {
  font-size: 0.92rem;
  border-left: 4px solid var(--accent);
  padding: 0.75rem 1rem;
  background: rgba(56, 189, 248, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}
.cta label {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  font-weight: normal;
  color: var(--text-secondary);
}
.cta input[type="checkbox"] {
  flex-shrink: 0;
  margin-top: 0.3rem;
  accent-color: var(--accent);
}

/* ---------- Success / Error Messages ---------- */
.ok {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
  padding: 0.7rem 0.9rem;
  border-radius: 8px;
  margin-top: 0.6rem;
  display: none;
  font-weight: 500;
}
.err {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
  padding: 0.7rem 0.9rem;
  border-radius: 8px;
  margin-top: 0.6rem;
  display: none;
  font-weight: 500;
}

/* ---------- Honeypot ---------- */
.hp { position: absolute !important; left: -9999px !important; visibility: hidden !important; }

/* ---------- Footer ---------- */
footer {
  max-width: 860px;
  margin: 2rem auto 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--ring);
  padding: 2rem 1rem 0;
}
.footer-links { margin-top: 0.5rem; }
.footer-links a { margin: 0 10px; font-weight: 500; }

/* ---------- Back Link (legal pages) ---------- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--accent); }

/* ---------- Legal Page Layout ---------- */
.legal-page { max-width: 920px; margin: auto; padding: 1rem; }
.legal-page h1 { margin: 0.2em 0 0.4em; }
.legal-page h2 { color: var(--text-primary); }
.legal-page ul { color: var(--text-secondary); line-height: 1.7; }
.legal-page p { color: var(--text-secondary); line-height: 1.7; }

/* ---------- Smooth Scroll ---------- */
html { scroll-behavior: smooth; }

/* ---------- Selection ---------- */
::selection {
  background: rgba(56, 189, 248, 0.3);
  color: #fff;
}

/* ---------- Scrollbar (webkit) ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--ring); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }