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

/* ─── LIGHT MODE (default) ───
   Brand: Blue #285ddd + Dark Blue #041b45 (matches assets/css/index.css). */
:root {
  --ink: #041b45;
  --paper: #f5f7fc;
  --accent: #285ddd;
  --accent-light: #dce8fd;
  --accent-dark: #041b45;
  --green: #059669;
  --green-light: #d1fae5;
  --amber: #d97706;
  --amber-light: #fef3c7;
  --muted: #5b6b85;
  --border: #dce3f0;
  --card-bg: #ffffff;
  --radius: 12px;
  --font-display: "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  --nav-bg: rgba(245, 247, 252, 0.92);
  --toggle-bg: #041b45;
  --toggle-color: #ffffff;
  --toggle-border: rgba(255, 255, 255, 0.15);
  --toggle-shadow: 0 4px 20px rgba(4, 27, 69, 0.22);
}

/* ─── DARK MODE ─── */
html.dark {
  --ink: #eef2f9;
  --paper: #060c18;
  --accent: #285ddd;
  --accent-light: rgba(40, 93, 221, 0.16);
  --accent-dark: #7ea3f5;
  --green: #10b981;
  --green-light: rgba(16, 185, 129, 0.15);
  --amber: #f59e0b;
  --amber-light: rgba(245, 158, 11, 0.15);
  --muted: #90a1bf;
  --border: #1c2942;
  --card-bg: #0d1526;
  --radius: 12px;

  --nav-bg: rgba(6, 12, 24, 0.92);
  --toggle-bg: #eef2f9;
  --toggle-color: #041b45;
  --toggle-border: rgba(0, 0, 0, 0.1);
  --toggle-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  transition:
    background 0.3s ease,
    color 0.3s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 700;
  font-style: normal;
  line-height: 26px;
}

/* ─── NAV ─── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 48px;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition:
    background 0.3s ease,
    border-color 0.3s ease;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.5px;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 110;
  position: relative;
  transition: color 0.3s ease;
}

.nav-logo-img {
  height: 44px;
  width: auto;
  max-height: 44px;
  max-width: 120px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-logo .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  transition: background 0.3s ease;
}

.nav-spacer {
  flex: 1;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-back {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  transition:
    border-color 0.2s,
    background 0.2s,
    color 0.3s ease;
}

.nav-back:hover {
  border-color: var(--ink);
  background: rgba(14, 14, 14, 0.04);
}

html.dark .nav-back:hover {
  background: rgba(240, 237, 230, 0.06);
}

/* ─── MAIN CONTAINER ─── */
.login-container {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 120px 48px 80px;
  position: relative;
  overflow: hidden;
}

.login-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(
      ellipse 700px 500px at 80% 20%,
      rgba(40, 93, 221, 0.07) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 500px 400px at 10% 80%,
      rgba(5, 150, 105, 0.06) 0%,
      transparent 60%
    );
  transition: opacity 0.3s ease;
}

html.dark .login-bg {
  background:
    radial-gradient(
      ellipse 700px 500px at 80% 20%,
      rgba(40, 93, 221, 0.14) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 500px 400px at 10% 80%,
      rgba(16, 185, 129, 0.1) 0%,
      transparent 60%
    );
}

.login-card {
  position: relative;
  z-index: 1;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 60px 48px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
  transition:
    background 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease;
  animation: slideUp 0.6s ease both;
}

html.dark .login-card {
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.login-header {
  margin-bottom: 36px;
  text-align: center;
}

.login-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.1;
  margin-bottom: 10px;
  transition: color 0.3s ease;
}

.login-subtitle {
  font-size: 14px;
  color: var(--muted);
  font-weight: 300;
  transition: color 0.3s ease;
}

/* ─── FORM ─── */
.login-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  transition: color 0.3s ease;
}

.form-group.password-group {
  position: relative;
}

.form-group input {
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  transition:
    border-color 0.2s,
    background 0.2s,
    box-shadow 0.2s;
  outline: none;
}

.form-group.password-group input {
  padding-right: 48px;
}

html.dark .form-group input {
  background: rgba(240, 237, 230, 0.05);
}

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

html.dark .form-group input:focus {
  box-shadow: 0 0 0 3px rgba(40, 93, 221, 0.2);
}

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

.password-toggle {
  position: absolute;
  right: 14px;
  top: 38px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  transition: color 0.2s;
}

.password-toggle:hover {
  color: var(--ink);
}

.password-toggle svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
  margin-bottom: 12px;
  font-size: 13px;
}

.form-remember {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.form-remember input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: var(--accent);
}

.form-remember label {
  cursor: pointer;
  margin: 0;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
}

.form-forget {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.form-forget:hover {
  color: var(--accent-dark);
}

html.dark .form-forget:hover {
  color: var(--accent-dark);
}

/* ─── BUTTONS ─── */
.btn-login {
  background: var(--ink);
  color: var(--paper);
  padding: 15px 32px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  transition:
    background 0.2s,
    transform 0.15s,
    color 0.3s ease;
  margin-top: 12px;
}

.btn-login:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

.btn-login:active {
  transform: translateY(0);
}

/* ─── DIVIDER ─── */
.divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
  font-size: 13px;
  color: var(--muted);
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ─── SOCIAL ─── */
.social-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition:
    border-color 0.2s,
    background 0.2s,
    transform 0.15s;
}

.btn-social img,
.btn-social .google-logo {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

html.dark .btn-social {
  background: rgba(240, 237, 230, 0.03);
}

.btn-social:hover {
  border-color: var(--ink);
  background: rgba(14, 14, 14, 0.06);
  transform: translateY(-1px);
}

html.dark .btn-social:hover {
  background: rgba(240, 237, 230, 0.08);
}

/* ─── FOOTER TEXT ─── */
.login-footer {
  text-align: center;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}

.login-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.login-footer a:hover {
  color: var(--accent-dark);
}

/* ─── THEME TOGGLE BUTTON ─── */
.theme-toggle {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 200;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: var(--toggle-bg);
  color: var(--toggle-color);
  box-shadow: var(--toggle-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background 0.3s ease,
    color 0.3s ease,
    transform 0.2s ease,
    box-shadow 0.3s ease;
  outline: none;
}

.theme-toggle:hover {
  transform: scale(1.1) translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
}

html.dark .theme-toggle:hover {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.6);
}

.theme-toggle:active {
  transform: scale(0.96);
}

.theme-toggle svg {
  width: 22px;
  height: 22px;
  transition:
    opacity 0.25s ease,
    transform 0.35s ease;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition:
    opacity 0.25s ease,
    transform 0.35s ease;
}

.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.7);
}

.theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

html.dark .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

html.dark .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.7);
}

.theme-toggle::after {
  content: attr(data-tooltip);
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--toggle-bg);
  color: var(--toggle-color);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  padding: 6px 12px;
  border-radius: 8px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease 0.1s;
  box-shadow: var(--toggle-shadow);
}

.theme-toggle:hover::after {
  opacity: 1;
}

/* ─── ANIMATIONS ─── */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── RESPONSIVE: MOBILE (≤640px) ─── */
@media (max-width: 640px) {
  nav {
    padding: 16px 24px;
  }

  .login-container {
    padding: 100px 24px 64px;
  }

  .login-card {
    padding: 40px 24px;
    border-radius: 20px;
  }

  .login-title {
    font-size: 26px;
    letter-spacing: -0.8px;
  }

  .login-subtitle {
    font-size: 13px;
  }

  .form-group input {
    padding: 12px 14px;
    font-size: 14px;
  }

  .btn-login,
  .btn-social {
    font-size: 14px;
    padding: 13px 24px;
  }

  .theme-toggle {
    bottom: 16px;
    right: 16px;
    width: 46px;
    height: 46px;
  }

  .theme-toggle::after {
    display: none;
  }
}

/* ─── RESPONSIVE: SMALL MOBILE (≤380px) ─── */
@media (max-width: 380px) {
  .login-card {
    padding: 32px 20px;
    border-radius: 16px;
  }

  .login-title {
    font-size: 22px;
    letter-spacing: -0.6px;
  }

  .form-group input {
    padding: 11px 12px;
    font-size: 13px;
  }

  .form-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}