/* ─── Reset & Base ──────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ─── Dark Theme (default) ──────────────────────────── */
:root {
  --wa-green: #25D366;
  --wa-dark: #075E54;
  --wa-teal: #128C7E;

  --bg-primary: #0a0f1a;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-border: rgba(255, 255, 255, 0.08);
  --bg-glow-1: rgba(38, 187, 222, 0.08);
  --bg-glow-2: rgba(26, 143, 176, 0.06);
  --card-shadow-1: rgba(255, 255, 255, 0.03);
  --card-shadow-2: rgba(0, 0, 0, 0.4);
  --card-shadow-3: rgba(38, 187, 222, 0.04);

  --text-primary: #f0f2f5;
  --text-secondary: #8696a0;
  --text-muted: #5a6670;

  --input-bg: rgba(255, 255, 255, 0.06);
  --input-border: rgba(255, 255, 255, 0.12);
  --input-focus: rgba(38, 187, 222, 0.4);

  --code-bg: rgba(0, 0, 0, 0.3);
  --usage-box-bg: rgba(38, 187, 222, 0.06);
  --usage-box-border: rgba(38, 187, 222, 0.12);
  --spinner-track: rgba(38, 187, 222, 0.15);
  --btn-gradient-start: #1a8fb0;
  --btn-gradient-end: #26bbde;
  --btn-hover-shadow: rgba(38, 187, 222, 0.25);
  --accent: #26bbde;
  --input-focus-color: #26bbde;

  --toggle-bg: rgba(255, 255, 255, 0.08);
  --toggle-border: rgba(255, 255, 255, 0.12);
  --toggle-color: #8696a0;

  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Light Theme (Slace-inspired) ──────────────────── */
[data-theme="light"] {
  --bg-primary: #f0f0f0;
  --bg-card: #ffffff;
  --bg-card-border: #dadada;
  --bg-glow-1: rgba(38, 187, 222, 0.06);
  --bg-glow-2: rgba(37, 211, 102, 0.04);
  --card-shadow-1: rgba(0, 0, 0, 0.02);
  --card-shadow-2: rgba(0, 0, 0, 0.08);
  --card-shadow-3: rgba(0, 0, 0, 0.02);

  --text-primary: #333333;
  --text-secondary: #4d5358;
  --text-muted: #a3a3a3;

  --input-bg: #ffffff;
  --input-border: #dadada;
  --input-focus: rgba(38, 187, 222, 0.25);
  --input-focus-color: #26bbde;

  --code-bg: #f5f5f5;
  --usage-box-bg: #eef8fb;
  --usage-box-border: #bee3ed;
  --spinner-track: rgba(38, 187, 222, 0.2);
  --btn-gradient-start: #1a8fb0;
  --btn-gradient-end: #26bbde;
  --btn-hover-shadow: rgba(38, 187, 222, 0.3);

  --toggle-bg: #ffffff;
  --toggle-border: #dadada;
  --toggle-color: #4d5358;

  --accent: #26bbde;
}

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
}

/* ─── Animated Background ───────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 30%, var(--bg-glow-1), transparent),
    radial-gradient(ellipse 500px 500px at 80% 70%, var(--bg-glow-2), transparent);
  pointer-events: none;
  z-index: 0;
  animation: bgPulse 8s ease-in-out infinite alternate;
  transition: background 0.5s ease;
}

@keyframes bgPulse {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

/* ─── Layout ────────────────────────────────────────── */
.container {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

/* ─── Theme Toggle ──────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  border-radius: 12px;
  color: var(--toggle-color);
  cursor: pointer;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition), border-color var(--transition),
              color var(--transition), transform var(--transition),
              box-shadow var(--transition);
}

.theme-toggle:hover {
  transform: scale(1.08);
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 4px 16px var(--btn-hover-shadow);
}

.theme-toggle:active {
  transform: scale(0.95);
}

/* Icon visibility: dark mode shows sun, light mode shows moon */
.icon-sun {
  display: block;
}
.icon-moon {
  display: none;
}
[data-theme="light"] .icon-sun {
  display: none;
}
[data-theme="light"] .icon-moon {
  display: block;
}

/* ─── Card ──────────────────────────────────────────── */
.card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius);
  padding: 48px 36px 40px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow:
    0 0 0 1px var(--card-shadow-1),
    0 20px 60px var(--card-shadow-2),
    0 0 120px var(--card-shadow-3);
  animation: cardIn 0.6s ease-out;
  transition: background var(--transition), border-color var(--transition),
              box-shadow var(--transition);
}

@keyframes cardIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ─── Logo ──────────────────────────────────────────── */
.logo {
  text-align: center;
  margin-bottom: 28px;
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* ─── Status Sections ───────────────────────────────── */
.status {
  text-align: center;
}

.status.hidden {
  display: none;
}

.status h1 {
  font-size: 1.375rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  transition: color var(--transition);
}

/* ─── Redirecting State ─────────────────────────────── */
.phone-display {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  margin-bottom: 24px;
}

.spinner {
  width: 36px;
  height: 36px;
  margin: 0 auto 20px;
  border: 3px solid var(--spinner-track);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--transition);
}

.hint a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.hint a:hover {
  text-decoration: underline;
}

/* ─── Error State ───────────────────────────────────── */
.error-msg {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
  transition: color var(--transition);
}

.usage-box {
  background: var(--usage-box-bg);
  border: 1px solid var(--usage-box-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: left;
  transition: background var(--transition), border-color var(--transition);
}

.usage-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.usage-box code {
  display: block;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.8rem;
  color: var(--text-primary);
  background: var(--code-bg);
  padding: 10px 14px;
  border-radius: 8px;
  word-break: break-all;
  margin-bottom: 10px;
  transition: background var(--transition), color var(--transition);
}

.usage-params {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.usage-params code {
  display: inline;
  font-size: 0.78rem;
  background: var(--code-bg);
  padding: 2px 7px;
  border-radius: 4px;
  transition: background var(--transition);
}

/* ─── Manual Form ───────────────────────────────────── */
#status-manual {
  text-align: left;
}

#status-manual h1 {
  text-align: center;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.form-group .optional {
  color: var(--text-muted);
  font-weight: 400;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition),
              background var(--transition), color var(--transition);
  resize: vertical;
}

.form-group textarea {
  min-height: 80px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--input-focus-color);
  box-shadow: 0 0 0 3px var(--input-focus);
}

#btn-send {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--btn-gradient-start), var(--btn-gradient-end));
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#btn-send:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--btn-hover-shadow);
  filter: brightness(1.1);
}

#btn-send:active {
  transform: translateY(0);
}

/* ─── Footer ────────────────────────────────────────── */
footer {
  margin-top: 32px;
  text-align: center;
}

footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

/* ─── Responsive ────────────────────────────────────── */
@media (max-width: 480px) {
  .card {
    padding: 36px 24px 32px;
    border-radius: 14px;
  }

  .status h1 {
    font-size: 1.2rem;
  }

  .theme-toggle {
    top: 12px;
    right: 12px;
    width: 40px;
    height: 40px;
  }
}