/* ========== base variables (light as default) ========== */
:root {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --card: #ffffff;
  --accent: #0b74ff;
  --text: #0f1724;
  --muted: #00000;
  --radius: 12px;
  --font-size: 16px;
  --font-title: 28px;
  --font-small: 14px;
}
/* theme classes override variables */
.theme-dark {
  --bg: #081a31e0;
  --surface: #16293e;
  --card: #111821;
  --accent: #0b74ff;
  --text: #e6eef6;
  --muted: #000000;
}

/* ========== global styles ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  min-height: clamp(100vh, 80vh, 1200px);
  height: AUTO;
  margin: 0;
  font-family: Inter, system-ui, Arial;
  background: var(--bg);
  color: var(--text);
  transition: background 0.25s, color 0.25s;
  -webkit-font-smoothing: antialiased;
}
.container {
  padding: 16px;
  max-width: 900px;
  margin: 0 auto;
}

h1 {
  margin: 6px 0 14px;
  font-size: clamp(18px, 2.2vw, 28px);
}
p {
  color: #000000;
  line-height: 1.5;
}
.theme-dark p {
  color: #ffffff;
}

/* ========== card area ========== */
.card {
  background: #bdcee591;
  padding: 14px;
  border-radius: var(--radius);
  box-shadow: 0 6px 18px rgba(2, 6, 23, 0.06);
  border: 1px solid #607d8b;
  margin-bottom: 12px;
}
.theme-dark .card {
  background: #02163191;
}
/* ========== pages (single page app sections) ========== */
.page,
.subpage {
  display: none;
  padding-bottom: 90px;
}
/* leave space for tabbar */
.page.active,
.subpage.active {
  display: block;
}

/* ========== modal login ========== */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(rgba(2, 6, 23, 0.45), rgba(2, 6, 23, 0.45));
  z-index: 999;
  padding: 20px;
  visibility: hidden;
  opacity: 0;
  transition: 0.18s ease;
}
.modal.show {
  visibility: visible;
  opacity: 1;
}
.modal-box {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  padding: 18px;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.2);
  border: 1px solid #607d8b;
}
.modal-box h2 {
  margin: 0 0 8px;
  color: var(--text);
}
.close-x {
  float: right;
  cursor: pointer;
  font-size: 20px;
  color: var(--muted);
}
.theme-dark .close-x {
  color: #ffffff;
}
.form-row {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
input[type='text'],
input[type='password'] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid rgba(15, 23, 36, 0.08);
  background: var(--card);
  color: var(--text);
  font-size: clamp(14px, 1.4vw, 16px);
}
.btn {
  margin-top: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  font-size: clamp(14px, 1.4vw, 16px);
}

/* ========== tabbar (mobile app style fixed bottom) ========== */
.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 12px;
  margin: 0 auto;
  display: flex;
  gap: 8px;
  justify-content: space-between;
  align-items: center;
  width: min(720px, calc(100% - 24px));
  height: 64px;
  padding: 8px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.6),
    rgba(255, 255, 255, 0.6)
  );
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.12);
  border-radius: 16px;
  z-index: 998;
  border: 1px solid rgba(15, 23, 36, 0.06);
}
button .tab-item :hover {
  background: #000000;
  transform: scale(1.03);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}

/* ensure tabbar color matches theme (slightly card-like) */
body.theme-dark .tabbar {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.6),
    rgba(255, 255, 255, 1)
  );
  border: 1px solid rgba(255, 255, 255, 0.04);
}

/* Khi ẩn xuống */
.tabbar.hide {
  transform: translateY(120%);
}

.tab-item {
  flex: 1;
  white-space: nowrap;
  display: flex;
  flex-direction: column;
  gap: 2px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: clamp(
    12px,
    1.8vw,
    16px
  ); /* responsive size: phone small, desktop larger */
  padding: 6px 8px;
  transition: color 0.18s, transform 0.12s;
}
.tab-item .icon {
  font-size: clamp(18px, 3.6vw, 22px);
}
.tab-item.active {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ensure touch targets good on mobile */
@media (max-width: 420px) {
  .tabbar {
    height: 56px;
    border-radius: 12px;
    padding: 6px;
    bottom: 8px;
  }
  .tab-item {
    font-size: clamp(11px, 3.6vw, 13px);
  }
}

/* small helper for theme button list */
.themes {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.theme-chip {
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--text);
  border: 1px solid #000000;
  font-size: 14px;
}
.theme-dark .theme-chip {
  border: 1px solid #607d8b;
}
/* =================== HOME CARD GRID =================== */
.card-grid {
  display: grid;
  gap: 48px;
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* =================== HOME CARD =================== */

/* CARD */
.home-card {
  background: #05204a !important;
  border-radius: 15px !important;
  overflow: hidden;
  cursor: pointer;
  backdrop-filter: blur(10px);
  border: 2px solid #ff9800;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

/* HOVER: PHÓNG TO + GLOW MẠNH */
.home-card:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: 0 0 25px rgba(0, 255, 255, 0.4), 0 0 35px rgba(255, 0, 255, 0.25);
}

/* BÊN TRONG */
.home-card-inner {
  position: relative;
}

/* ẢNH */
.home-card img {
  width: 100%;
  object-fit: cover;
}

/* CHỮ */
.home-card h3 {
  margin: 12px;
  font-size: 1.35rem;
  color: #fff;
  text-shadow: 0 0 6px rgba(0, 255, 255, 0.5);
  font-weight: 700;
}

.home-card p {
  margin: 0 12px 14px;
  color: #cde;
  font-size: 0.95rem;
  opacity: 0.9;
}
/* =================== MAIN HEADER FULL-WIDTH =================== */
.main-header {
  display: flex;
  align-items: center; /* logo và text cùng hàng */
  gap: 16px;
  padding: 20px 24px;
  background: linear-gradient(135deg, #2065f2, #7a4dff);
  flex-wrap: wrap;
  opacity: 0.9;
}

.header-logo {
  width: clamp(80px, 10vw, 120px);
  height: auto;
  border-radius: 50%;
  object-fit: cover;
  background: #fff;
  padding: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
/* Khung căn giữa */
.header-inner {
  max-width: 900px;
  margin: auto;
  padding: 14px 20px;

  display: flex;
  align-items: center;
  gap: 16px;
}
.header-text-container {
  display: flex;
  flex-direction: column; /* chữ chính + phụ xếp dọc */
}

.header-text {
  font-family: 'Inter', sans-serif;
  font-size: clamp(24px, 6vw, 48px);
  font-weight: 700;
  color: #fff;
  text-shadow: 1px 1px 0 #aaa, 2px 2px 0 #999;
}

.header-subtext {
  font-size: clamp(12px, 2vw, 20px);
  font-weight: 500;
  color: #e0e0e0;
  margin-top: 4px;
}
/* Mobile */
@media (max-width: 640px) {
  .header-inner {
    gap: 12px;
    padding: 12px 14px;
  }

  .header-logo {
    width: 44px;
    height: 44px;
  }

  .header-text {
    font-size: 1.1rem;
  }

  .header-subtext {
    font-size: 0.75rem;
  }
}

/* THEME override: light/dark/blue/purple */
body.theme-dark .main-header {
  background: linear-gradient(356deg, #345f95, #070b0f);
  color: #e6eef6;
}

/* Mobile responsive */
@media (max-width: 600px) {
  .main-header {
    display: flex;
    align-items: center;
    padding: 16px 12px;
    gap: 12px;
  }
  .header-logo {
    width: 80px;
    height: 80px;
  }
  .header-text {
    font-size: clamp(12px, 8vw, 36px);
  }
}
/* =================== FOOTER =================== */
footer {
  background: #111827; /* dark modern bg */
  color: #e5e7eb;
  padding: 50px 20px 30px;
  font-family: Inter, system-ui, Arial;
  opacity: 0.9;
}

footer a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s, transform 0.2s;
}

footer a:hover {
  color: #3b82f6; /* highlight color */
  transform: scale(1.1);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
}

/* Logo & Info */
.footer-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.footer-logo img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 50%;
}

.footer-logo h3 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
}

.footer-logo p {
  font-size: 0.95rem;
  color: #9ca3af;
  margin: 0;
}

/* Social */
.footer-social {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.footer-social h4 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
  margin: 0;
}

.social-icons {
  display: flex;
  gap: 15px;
}

.social-icons svg {
  width: 28px;
  height: 28px;
  transition: transform 0.2s, fill 0.2s;
}

/* ================== Newsletter Pro ================== */
.footer-newsletter h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  text-align: center;
}

.newsletter-form {
  display: flex;
  width: 100%;
  max-width: 320px;
  background: #1f2937; /* dark container */
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.newsletter-form input {
  flex: 1;
  padding: 12px 16px;
  border: none;
  outline: none;
  font-size: 0.95rem;
  background: transparent;
  color: #f9fafb;
}

.newsletter-form input::placeholder {
  color: #9ca3af;
}

.newsletter-form button {
  padding: 0 20px;
  background: #3b82f6;
  color: #fff;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.newsletter-form button:hover {
  background: #2563eb;
  transform: translateY(-2px);
}

/* Responsive mobile */
@media (max-width: 480px) {
  .newsletter-form {
    flex-direction: column;
    border-radius: 12px;
  }

  .newsletter-form input,
  .newsletter-form button {
    width: 100%;
    border-radius: 0;
  }

  .newsletter-form button {
    border-radius: 0 0 12px 12px;
  }
}
/* Copyright */
.footer-copyright {
  width: 100%;
  text-align: center;
  margin-top: 30px;
  font-size: 0.875rem;
  color: #6b7280;
}