/* ─────────────────────────────────────────
   Login · style.css
   System-aware light / dark mode
   ───────────────────────────────────────── */


/* ── Tokens ── */
:root {
  --bg:           #f4f3f0;
  --surface:      #ffffff;
  --border:       #e2e1de;
  --border-focus: #1a1a1a;
  --text:         #1a1a1a;
  --text-muted:   #888880;
  --placeholder:  #bbb9b4;
  --btn-bg:       #1a1a1a;
  --btn-text:     #ffffff;
  --btn-hover:    #333;
  --error:        #c0392b;
  --error-bg:     #fdf0ef;
  --shadow:       0 2px 12px rgba(0, 0, 0, 0.07);
  --radius:       10px;
  --input-radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:           #111110;
    --surface:      #1c1c1b;
    --border:       #2e2e2c;
    --border-focus: #e8e8e5;
    --text:         #e8e8e5;
    --text-muted:   #666662;
    --placeholder:  #44443f;
    --btn-bg:       #e8e8e5;
    --btn-text:     #111110;
    --btn-hover:    #cfcfcc;
    --error:        #e05a4e;
    --error-bg:     #1f1210;
    --shadow:       0 2px 16px rgba(0, 0, 0, 0.35);
  }
}

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

/* ── Base ── */
html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  -webkit-font-smoothing: antialiased;
}

/* ── Card ── */
.login-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 360px;
  padding: 40px 36px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* ── Logo ── */
.login-logo {
  display: block;
  border-radius: 16px;          /* iOS-style rounded square */
  flex-shrink: 0;
}

/* ── Form ── */
form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ── Code input ── */
.code-input {
  width: 100%;
  padding: 13px 16px;
  font-family: inherit;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-align: center;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--input-radius);
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
  -webkit-appearance: none;
}

.code-input::placeholder {
  color: var(--placeholder);
  letter-spacing: 0.2em;
}

.code-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--border-focus) 12%, transparent);
}

.code-input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ── Submit button ── */
.btn-submit {
  width: 100%;
  padding: 13px 16px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  color: var(--btn-text);
  background: var(--btn-bg);
  border: none;
  border-radius: var(--input-radius);
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
  -webkit-appearance: none;
}

.btn-submit:hover:not(:disabled) {
  background: var(--btn-hover);
}

.btn-submit:active:not(:disabled) {
  opacity: 0.8;
}

.btn-submit:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Error message ── */
.error-message {
  width: 100%;
  padding: 10px 14px;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--error);
  background: var(--error-bg);
  border: 1px solid color-mix(in srgb, var(--error) 22%, transparent);
  border-radius: var(--input-radius);
  text-align: center;
}