/* ─── Light theme (default) ─────────────────────────── */
:root {
  color-scheme: light dark;

  --bg:            #f9fafb;
  --surface:       #ffffff;
  --border:        #e5e7eb;
  --border-subtle: #f3f4f6;
  --border-active: #111827;
  --text:          #111827;
  --text-2:        #374151;
  --text-3:        #6b7280;
  --text-4:        #9ca3af;
  --error:         #dc2626;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ─── Dark theme (system) ───────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:            #0f0f11;
    --surface:       #1a1a1f;
    --border:        #2a2a32;
    --border-subtle: #222228;
    --border-active: #9ca3af;
    --text:          #f3f4f6;
    --text-2:        #d1d5db;
    --text-3:        #9ca3af;
    --text-4:        #6b7280;
    --error:         #f87171;
  }
}

/* ─── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

/* ─── Typography ─────────────────────────────────────── */
h1 { font-size: 22px; font-weight: 700; line-height: 1.2; }
h2 { font-size: 18px; font-weight: 600; line-height: 1.3; }
p  { color: var(--text-3); line-height: 1.7; }

/* ─── Card ───────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 100%;
  max-width: 380px;
}

/* ─── Form elements ──────────────────────────────────── */
label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 4px;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  outline: none;
  margin-bottom: 16px;
  transition: border-color 0.15s;
}
input[type="text"]:focus,
input[type="password"]:focus { border-color: var(--border-active); }

textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  resize: none;
  outline: none;
  line-height: 1.5;
  transition: border-color 0.15s;
}
textarea:focus { border-color: var(--border-active); }

.error {
  color: var(--error);
  font-size: 13px;
  min-height: 18px;
  margin-bottom: 12px;
}

/* ─── Buttons ────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s, background 0.15s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:disabled      { opacity: 0.35; cursor: not-allowed; }
.btn-primary       { background: var(--text); color: var(--bg); }
.btn-primary:hover { opacity: 0.85; }
.btn-outline       { background: transparent; color: var(--text); border: 1.5px solid var(--border); }
.btn-outline:hover { background: var(--bg); }
.btn-ghost         { background: transparent; color: var(--text-3); border: none; }
.btn-ghost:hover   { color: var(--text); }
.btn-full          { width: 100%; }
.btn-sm            { padding: 5px 14px; font-size: 13px; }

/* ─── Page centering (auth pages) ────────────────────── */
.page-center {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}
.page-center .auth-logo { display: block; margin-bottom: 28px; }
.page-center .card h1 { margin-bottom: 24px; }
.page-center .card h1:has(+ .hint) { margin-bottom: 6px; }
input#code { font-family: ui-monospace, monospace; letter-spacing: 0.12em; text-transform: uppercase; }
.hint { font-size: 13px; color: var(--text-3); margin-bottom: 24px; }
.page-center .footer-link {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-3);
  text-align: center;
}
.page-center .footer-link a {
  color: var(--text);
  font-weight: 500;
}

/* ─── App header ─────────────────────────────────────── */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  height: 52px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.logo {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.logo .seven { color: var(--text-3); }
.app-header .right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.app-header .username { font-size: 13px; color: var(--text-3); }

/* ─── Footer (global) ────────────────────────────────── */
footer {
  text-align: center;
  padding: 24px 16px;
  font-size: 12px;
  color: var(--text-4);
}
footer a { color: var(--text-4); }
footer a:hover { color: var(--text-3); }