/* ============================================
   NTU - Login Page Stylesheet
   Colors aligned with base.css (--primary: #003366)
   ============================================ */

:root {
  --primary-dark:   #002244;
  --primary-color:  #003366;
  --primary-light:  #0066cc;
  --secondary-color:#0080ff;
  --accent-color:   #ff6600;
  --accent-light:   #ff8c40;
  --white:          #ffffff;
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.28);
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-2xl: 32px;
  --transition-base:   200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

body {
  font-family: 'Cairo', 'Tajawal', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 55%, var(--primary-light) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  overflow-x: hidden;
}

/* ── Background decorations ─────────────────── */
.bg-decoration {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-decoration::before {
  content: '';
  position: absolute;
  width: 560px; height: 560px;
  background: radial-gradient(circle, rgba(255, 102, 0, 0.12) 0%, transparent 70%);
  top: -180px; inset-inline-end: -180px;
  border-radius: 50%;
  animation: floatOrb 22s ease-in-out infinite;
}

.bg-decoration::after {
  content: '';
  position: absolute;
  width: 460px; height: 460px;
  background: radial-gradient(circle, rgba(0, 102, 204, 0.1) 0%, transparent 70%);
  bottom: -130px; inset-inline-start: -130px;
  border-radius: 50%;
  animation: floatOrb 28s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%,100% { transform: translate(0,0) scale(1); }
  25%      { transform: translate(40px,-25px) scale(1.08); }
  50%      { transform: translate(-15px,35px) scale(0.94); }
  75%      { transform: translate(25px,18px) scale(1.04); }
}

/* Floating particles */
.particles { position: fixed; inset: 0; pointer-events: none; z-index: 0; }
.particle {
  position: absolute;
  width: 4px; height: 4px;
  background: rgba(255,255,255,0.28);
  border-radius: 50%;
  animation: particleFloat 18s infinite;
}
.particle:nth-child(1){ left:10%; animation-delay:0s;   animation-duration:22s; }
.particle:nth-child(2){ left:22%; animation-delay:2s;   animation-duration:19s; }
.particle:nth-child(3){ left:34%; animation-delay:4s;   animation-duration:24s; }
.particle:nth-child(4){ left:46%; animation-delay:1s;   animation-duration:20s; }
.particle:nth-child(5){ left:58%; animation-delay:3s;   animation-duration:23s; }
.particle:nth-child(6){ left:70%; animation-delay:5s;   animation-duration:18s; }
.particle:nth-child(7){ left:82%; animation-delay:2.5s; animation-duration:25s; }
.particle:nth-child(8){ left:90%; animation-delay:4.5s; animation-duration:17s; }

@keyframes particleFloat {
  0%   { transform: translateY(100vh) rotate(0deg);   opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}

/* ── Wrapper ────────────────────────────────── */
.main-wrapper {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 40px);
}

.login-container {
  width: 100%;
  max-width: 460px;
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(36px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}

/* ── Login Card ─────────────────────────────── */
.login-card {
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl), inset 0 1px 0 rgba(255,255,255,0.6);
  padding: 46px 42px;
  position: relative;
  overflow: hidden;
}

/* top color bar */
.login-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-color), var(--secondary-color), var(--accent-color));
  background-size: 200% 100%;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0%,100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

/* ── Header ─────────────────────────────────── */
.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.university-logo {
  width: 84px; height: 84px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light), var(--secondary-color));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 10px 28px rgba(0,51,102,0.3), 0 0 0 4px rgba(0,51,102,0.1);
  animation: logoPulse 4s ease-in-out infinite;
}

@keyframes logoPulse {
  0%,100% { box-shadow: 0 10px 28px rgba(0,51,102,0.3), 0 0 0 4px rgba(0,51,102,0.1); }
  50%      { box-shadow: 0 14px 36px rgba(0,51,102,0.4), 0 0 0 6px rgba(0,51,102,0.15); }
}

.university-logo i {
  font-size: 2.6rem;
  color: var(--white);
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.18));
}

.login-title {
  color: var(--primary-color);
  font-weight: 800;
  font-size: 1.8rem;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.university-name {
  color: #64748b;
  font-weight: 500;
  font-size: 0.92rem;
  margin-bottom: 3px;
}

.university-name-en {
  color: #94a3b8;
  font-weight: 400;
  font-size: 0.82rem;
}

/* ── Form ───────────────────────────────────── */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  font-weight: 600;
  color: #334155;
  margin-bottom: 8px;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 7px;
}

.form-label i {
  color: var(--secondary-color);
  font-size: 0.95rem;
}

.input-wrapper {
  position: relative;
}

.input-icon {
  position: absolute;
  inset-inline-end: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: #94a3b8;
  font-size: 1.1rem;
  transition: var(--transition-base);
  z-index: 2;
  pointer-events: none;
}

.form-control {
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 13px 46px 13px 15px;
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition-base);
  background: #f8fafc;
  color: #1e293b;
  width: 100%;
}

.form-control::placeholder { color: #94a3b8; }

.form-control:hover {
  border-color: #cbd5e1;
  background: var(--white);
}

.form-control:focus {
  border-color: var(--secondary-color);
  background: var(--white);
  box-shadow: 0 0 0 4px rgba(0,102,204,0.1);
  outline: none;
}

.form-control:focus + .input-icon {
  color: var(--secondary-color);
}

/* ── Submit Button ──────────────────────────── */
.btn-submit {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border: none;
  border-radius: var(--radius-md);
  padding: 15px 24px;
  font-weight: 700;
  font-size: 1rem;
  font-family: inherit;
  width: 100%;
  color: var(--white);
  box-shadow: 0 4px 16px rgba(0,51,102,0.28), inset 0 1px 0 rgba(255,255,255,0.1);
  transition: var(--transition-slow);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 8px;
  position: relative;
  overflow: hidden;
}

.btn-submit::before {
  content: '';
  position: absolute;
  top: 0; inset-inline-start: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.18), transparent);
  transition: inset-inline-start 0.5s;
}

.btn-submit:hover::before { inset-inline-start: 100%; }

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0,51,102,0.38);
}

.btn-submit:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0,51,102,0.28);
}

.btn-submit:disabled,
.btn-submit.loading {
  opacity: 0.75;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-submit.loading .btn-text { display: none; }

.btn-submit.loading::after {
  content: '';
  width: 20px; height: 20px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spinBtn 0.75s linear infinite;
}

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

/* ── Alerts ─────────────────────────────────── */
.alert {
  border-radius: var(--radius-md);
  border: none;
  padding: 13px 16px;
  margin-bottom: 18px;
  font-size: 0.88rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 9px;
  animation: alertSlide 0.35s cubic-bezier(0.16,1,0.3,1);
}

@keyframes alertSlide {
  from { opacity:0; transform:translateY(-10px) scale(0.96); }
  to   { opacity:1; transform:translateY(0) scale(1); }
}

.alert-success { background: linear-gradient(135deg,#d1fae5,#a7f3d0); color:#065f46; border-inline-end:4px solid #10b981; }
.alert-danger,
.alert-error   { background: linear-gradient(135deg,#fee2e2,#fecaca); color:#991b1b; border-inline-end:4px solid #ef4444; }
.alert-warning { background: linear-gradient(135deg,#fef3c7,#fde68a); color:#92400e; border-inline-end:4px solid #f59e0b; }
.alert-info    { background: linear-gradient(135deg,#dbeafe,#bfdbfe); color:#1e40af; border-inline-end:4px solid #3b82f6; }

.alert .btn-close { margin-inline-start: auto; opacity: 0.55; }
.alert .btn-close:hover { opacity: 1; }

/* ── Theme Toggle (fixed) ────────────────────── */
.theme-toggle {
  position: fixed;
  bottom: 28px;
  inset-inline-start: 28px;
  width: 50px; height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: var(--white);
  border: none;
  box-shadow: 0 6px 20px rgba(0,51,102,0.35);
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: var(--transition-slow);
}

.theme-toggle:hover {
  transform: scale(1.1) rotate(15deg);
  box-shadow: 0 10px 28px rgba(0,51,102,0.45);
}

/* ── Footer ─────────────────────────────────── */
.footer-info {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0,34,68,0.92) 100%);
  padding: 38px 20px 18px;
  z-index: 5;
  pointer-events: none;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  pointer-events: auto;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.88);
  font-weight: 600;
  font-size: 0.88rem;
}

.footer-brand i { font-size: 1.15rem; color: var(--accent-light); }

.footer-divider {
  width: 1px; height: 18px;
  background: rgba(255,255,255,0.2);
}

.footer-developers {
  color: rgba(255,255,255,0.65);
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 7px;
}

.developers-trigger {
  color: var(--accent-light);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  text-decoration: none;
}

.developers-trigger:hover { color: var(--accent-color); }

.footer-copyright {
  color: rgba(255,255,255,0.45);
  font-size: 0.78rem;
}

/* ── Developers Modal ────────────────────────── */
.modal-developers .modal-content {
  border-radius: var(--radius-xl);
  border: none;
  overflow: hidden;
}

.modal-developers .modal-header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: var(--white);
  padding: 24px 28px;
  border: none;
}

.modal-developers .modal-title {
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-developers .btn-close { filter: invert(1); opacity: 0.8; }

.modal-developers .modal-body {
  padding: 28px;
  background: #f8fafc;
}

.developer-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 14px;
  transition: var(--transition-slow);
  border: 1px solid #e2e8f0;
  position: relative;
  overflow: hidden;
}

.developer-card::before {
  content: '';
  position: absolute;
  top: 0; inset-inline-end: 0;
  width: 4px; height: 100%;
  background: linear-gradient(180deg, var(--secondary-color), var(--accent-color));
  opacity: 0;
  transition: var(--transition-slow);
}

.developer-card:last-child { margin-bottom: 0; }

.developer-card:hover {
  transform: translateX(-4px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border-color: #cbd5e1;
}

.developer-card:hover::before { opacity: 1; }

.developer-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 9px;
}

.developer-name i { color: var(--secondary-color); font-size: 1.1rem; }

.developer-role {
  color: #64748b;
  font-size: 0.88rem;
  font-weight: 500;
  padding-inline-end: 28px;
}

/* ── Dark theme on login ─────────────────────── */
[data-theme="dark"] {
  --primary-color:  #4a9eff;
  --primary-light:  #66b3ff;
  --secondary-color:#80c8ff;
}

[data-theme="dark"] body {
  background: linear-gradient(135deg, #0a0f1e 0%, #0d1b2a 55%, #1a2d40 100%);
}

[data-theme="dark"] .login-card {
  background: rgba(30,41,59,0.98);
}

[data-theme="dark"] .login-title  { color: #93c5fd; }
[data-theme="dark"] .university-name { color: #94a3b8; }
[data-theme="dark"] .university-name-en { color: #64748b; }

[data-theme="dark"] .form-label { color: #cbd5e1; }
[data-theme="dark"] .form-label i { color: var(--secondary-color); }

[data-theme="dark"] .form-control {
  background: #1e293b;
  border-color: #334155;
  color: #e2e8f0;
}

[data-theme="dark"] .form-control:focus {
  background: #1e293b;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 4px rgba(74,158,255,0.15);
}

[data-theme="dark"] .developer-card {
  background: #1e293b;
  border-color: #334155;
}

[data-theme="dark"] .modal-developers .modal-body { background: #0f172a; }

/* ── Responsive ─────────────────────────────── */
@media (max-width: 576px) {
  body { padding: 14px; }

  .login-card {
    padding: 32px 22px;
    border-radius: var(--radius-xl);
  }

  .university-logo { width: 70px; height: 70px; }
  .university-logo i { font-size: 2.1rem; }
  .login-title { font-size: 1.5rem; }

  .theme-toggle {
    bottom: 18px;
    inset-inline-start: 18px;
    width: 44px; height: 44px;
    font-size: 1.1rem;
  }

  .footer-content { flex-direction: column; text-align: center; }
  .footer-left, .footer-developers { flex-direction: column; gap: 8px; }
  .footer-divider { display: none; }
}