/* style.css */
:root {
  --bg-deep: #050507;
  --bg-surface: rgba(18, 20, 23, 0.65);
  --border-metal: rgba(255, 255, 255, 0.08);
  --border-active: rgba(255, 255, 255, 0.22);
  --card-highlight: rgba(255, 255, 255, 0.04);
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --glass-blur: 20px;
  --radius: 6px;
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.55), 0 4px 12px rgba(0, 0, 0, 0.35);
  --blob-1: rgba(45,48,54,0.35);
  --blob-2: rgba(30,32,36,0.25);
  --sweep-color: rgba(255,255,255,0.025);
  --input-bg: rgba(0, 0, 0, 0.35);
  --input-shadow: inset 0 1px 2px rgba(0,0,0,0.4);
  --btn-start: #2a2d33;
  --btn-end: #181a1d;
  --btn-text: #e5e7eb;
  --btn-border: rgba(255,255,255,0.06);
  --error-color: #d1d5db;
  --error-bg: rgba(209, 213, 219, 0.05);
  --error-border: rgba(209, 213, 219, 0.45);
  --locked-start: #2a2a2a;
  --locked-end: #1a1a1a;
  --locked-text: #d1d5db;
  --locked-border: rgba(200, 200, 200, 0.2);
  --pulse-color: rgba(200, 200, 200, 0.15);
  --toggle-bg: rgba(255,255,255,0.05);
  --toggle-border: rgba(255,255,255,0.1);
  --toggle-hover: rgba(255,255,255,0.12);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-deep: #f8f9fb;
  --bg-surface: rgba(255, 255, 255, 0.75);
  --border-metal: rgba(0, 0, 0, 0.08);
  --border-active: rgba(0, 0, 0, 0.18);
  --card-highlight: rgba(0, 0, 0, 0.03);
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --blob-1: rgba(200, 205, 215, 0.4);
  --blob-2: rgba(180, 185, 195, 0.3);
  --sweep-color: rgba(0, 0, 0, 0.03);
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
  --btn-start: #f9fafb;
  --btn-end: #e5e7eb;
  --btn-text: #374151;
  --btn-border: rgba(0,0,0,0.08);
  --error-color: #991b1b;
  --error-bg: rgba(153, 27, 27, 0.04);
  --error-border: rgba(153, 27, 27, 0.35);
  --locked-start: #e5e7eb;
  --locked-end: #d1d5db;
  --locked-text: #4b5563;
  --locked-border: rgba(0, 0, 0, 0.1);
  --pulse-color: rgba(0, 0, 0, 0.08);
  --toggle-bg: rgba(0,0,0,0.04);
  --toggle-border: rgba(0,0,0,0.1);
  --toggle-hover: rgba(0,0,0,0.08);
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  width: 100%; height: 100%; margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.bg-glow {
  position: fixed; inset: 0; z-index: 0;
  background: var(--bg-deep);
  overflow: hidden;
}
.bg-glow::before {
  content: ''; position: absolute;
  width: 130%; height: 130%;
  top: -15%; left: -15%;
  background: linear-gradient(125deg, var(--blob-1) 0%, transparent 45%, var(--blob-2) 100%);
  filter: blur(120px);
  animation: drift 22s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes drift {
  0% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(2%, 1.5%) rotate(0.8deg); }
  100% { transform: translate(-1.5%, -1%) rotate(-0.5deg); }
}

body::after {
  content: ''; position: fixed; inset: 0; z-index: 1;
  background: linear-gradient(90deg, transparent 0%, var(--sweep-color) 48%, transparent 52%, transparent 100%);
  background-size: 160% 100%;
  animation: sweep 14s linear infinite;
  pointer-events: none;
}
@keyframes sweep {
  0% { background-position: -60% 0; }
  100% { background-position: 160% 0; }
}

.login-container {
  position: relative; z-index: 2;
  height: 100%; display: flex; align-items: center; justify-content: center;
  padding: 24px;
}

.login-box {
  position: relative;
  width: 100%; max-width: 360px;
  padding: 32px 26px;
  background: transparent;
  border-radius: var(--radius);
  border: 1px solid var(--border-metal);
  box-shadow: var(--shadow-card), inset 0 1px 0 var(--card-highlight);
  text-align: center;
}

@keyframes slideUp {
  0% { transform: translate3d(0, 16px, 0); opacity: 0; }
  100% { transform: translate3d(0, 0, 0); opacity: 1; }
}

.logo img { width: 88px; margin: 0 auto 14px; display: block; filter: brightness(0.9) contrast(1.05); }
h1 { margin: 0 0 4px; font-size: 22px; font-weight: 600; letter-spacing: -0.01em; color: var(--text-primary); }
.subtitle { margin: 0 0 22px; font-size: 12.5px; color: var(--text-secondary); font-weight: 400; }

form { display: flex; flex-direction: column; gap: 16px; text-align: left; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 11px; font-weight: 600; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.09em;
}

.field input {
  width: 100%; padding: 11px 14px;
  border-radius: var(--radius); border: 1px solid var(--border-metal);
  background: var(--input-bg);
  color: var(--text-primary); font-size: 14px; font-family: inherit;
  outline: none; transition: var(--transition);
  box-shadow: var(--input-shadow);
}
.field input::placeholder { color: var(--text-muted); opacity: 0.55; }
.field input:hover { border-color: var(--border-active); }
.field input:focus-visible {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px var(--border-active), var(--input-shadow);
}

.field.error label { color: var(--error-color); }
.field.error input, input[aria-invalid="true"] {
  border-color: var(--error-border);
  background: var(--error-bg);
  box-shadow: 0 0 0 3px var(--error-border), var(--input-shadow);
}
.field-error {
  font-size: 11.5px; color: var(--error-color); font-weight: 500;
  opacity: 0; max-height: 0; margin-top: 0;
  transition: opacity 0.2s ease, max-height 0.2s ease, margin 0.2s ease;
  overflow: hidden;
}
.field.error .field-error { opacity: 1; max-height: 24px; margin-top: 5px; }

button {
  margin-top: 6px; padding: 12px;
  border-radius: var(--radius); border: 1px solid var(--btn-border);
  cursor: pointer;
  background: linear-gradient(180deg, var(--btn-start) 0%, var(--btn-end) 100%);
  color: var(--btn-text); font-size: 13.5px; font-weight: 500; letter-spacing: 0.02em;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15), inset 0 1px 0 rgba(255,255,255,0.05);
}
button:hover:not(:disabled):not(.locked) {
  filter: brightness(1.08);
  border-color: var(--border-active);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.08);
}
button:active:not(:disabled):not(.locked) { transform: translateY(0); }
button:disabled { opacity: 0.45; cursor: not-allowed; filter: grayscale(0.15); }
button:focus-visible { outline: 2px solid var(--border-active); outline-offset: 2px; }

button.locked {
  background: linear-gradient(180deg, var(--locked-start) 0%, var(--locked-end) 100%);
  border-color: var(--locked-border);
  color: var(--locked-text);
  animation: pulseLock 1.5s infinite alternate;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}
@keyframes pulseLock {
  0% { box-shadow: 0 0 0 0 var(--pulse-color); }
  100% { box-shadow: 0 0 0 7px transparent; }
}
button.unlocking {
  animation: none !important;
  background: linear-gradient(180deg, var(--btn-start) 0%, var(--btn-end) 100%);
  color: var(--btn-text);
  transition: background 0.4s ease, color 0.4s ease, box-shadow 0.4s ease;
}

#loginMessage {
  margin-top: 14px; font-size: 12.5px; min-height: 18px;
  opacity: 0; transform: translateY(-4px);
  transition: var(--transition); pointer-events: none;
}
#loginMessage.message-error {
  opacity: 1; transform: translateY(0); color: var(--error-color);
  font-weight: 500; pointer-events: auto;
}
#loginMessage .status-line { line-height: 1.4; }
#loginMessage .status-sub { font-size: 11.5px; opacity: 0.8; margin-top: 3px; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.shake {
  animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both;
}

.theme-toggle {
  position: fixed; top: 20px; right: 20px; z-index: 100;
  width: 40px; height: 40px;
  padding: 0; margin: 0;
  border-radius: 50%;
  border: 1px solid var(--toggle-border);
  background: var(--toggle-bg);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  outline: none;
}
.theme-toggle:hover { background: var(--toggle-hover); transform: scale(1.05); }
.theme-toggle:active { transform: scale(0.95); }
.theme-toggle:focus-visible { box-shadow: 0 0 0 3px var(--border-active); }

.theme-toggle svg { width: 18px; height: 18px; position: absolute; transition: opacity 0.2s ease, transform 0.2s ease; }
.theme-toggle .icon-sun { opacity: 0; transform: scale(0.8) rotate(-45deg); }
.theme-toggle .icon-moon { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: scale(0.8) rotate(45deg); }

@media (max-width: 480px) {
  .login-box { padding: 26px 20px; }
  .theme-toggle { top: 14px; right: 14px; width: 36px; height: 36px; }
}