/* ================= Header Styles ================= */

header {
  background-color: var(--bg-color);
  color: var(--text-color);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* =============== Navigation Styles =============== */
nav {
  height: auto;
  min-height: 70px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
}

.nav-left {
  display: flex;
  align-items: center;
  z-index: 101;
}

.nav-left a {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.nav-logo {
  height: 55px;
  width: auto;
  transition: transform 0.3s ease, filter 0.3s ease;
}

.nav-left .nav-logo:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.nav-center {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  transition: all 0.3s ease;
}

.nav-center ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  padding: 0;
  margin: 0;
  gap: 8px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 101;
}

.nav-right ul {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav ul {
  list-style: none;
}

nav li {
  display: inline-block;
}

nav a {
  display: block;
  color: var(--text-color);
  text-align: center;
  padding: 10px 16px;
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.3px;
  position: relative;
  transition: color 0.3s ease;
  white-space: nowrap;
  border-radius: 6px;
}

/* Apply hover effects only to nav links, not the logo or buttons */
nav li a:not(.btn-primary):not(.btn-secondary):hover,
nav li a:not(.btn-primary):not(.btn-secondary).active {
  color: var(--accent-color);
  background-color: var(--hover-bg);
}

nav li a:not(.btn-primary):not(.btn-secondary)::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent-color);
  transition: width 0.3s ease;
}

nav a:not(.btn-primary):not(.btn-secondary):hover::after,
nav a:not(.btn-primary):not(.btn-secondary).active::after {
  width: 50%;
}

nav a.active {
  font-weight: 600;
}

/* Responsive Navigation */
@media screen and (max-width: 1024px) {
  nav {
    padding: 0 15px;
  }
  
  nav a {
    padding: 10px 14px;
    font-size: 1rem;
  }
  
  .nav-logo {
    height: 48px;
  }
}

@media screen and (max-width: 768px) {
  nav {
    min-height: 60px;
    padding: 10px 15px;
    flex-wrap: nowrap;
  }

  /* Show hamburger button on mobile */
  .hamburger-btn {
    display: block !important;
    position: relative;
  }

  .nav-left {
    flex: 0 0 auto;
  }

  .nav-logo {
    height: 42px;
  }

  /* Mobile menu */
  .nav-center {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 99;
  }

  .nav-center.mobile-menu-open {
    max-height: 400px;
    opacity: 1;
    padding: 20px 0;
  }

  .nav-center ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 0 15px;
  }

  .nav-center li {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-center li:last-child {
    border-bottom: none;
  }

  .nav-center a {
    padding: 14px 16px;
    font-size: 1.05rem;
    text-align: left;
    border-radius: 0;
  }

  .nav-center a::after {
    display: none;
  }

  .nav-right {
    flex: 0 0 auto;
    order: 3;
  }

  .nav-right ul {
    gap: 4px;
  }

  .settings-button,
  .user-button {
    font-size: 0.9rem;
    padding: 6px 10px;
  }

  .gear-icon {
    width: 22px;
    height: 22px;
  }

  .user-avatar {
    width: 34px;
    height: 34px;
  }
}

@media screen and (max-width: 480px) {
  nav {
    padding: 8px 12px;
  }

  .nav-logo {
    height: 38px;
  }

  .hamburger-btn {
    font-size: 28px;
    padding: 6px 10px;
  }

  .nav-center a {
    font-size: 1rem;
    padding: 12px 14px;
  }

  .settings-button,
  .user-button {
    padding: 6px 8px;
    font-size: 0.85rem;
  }

  .gear-icon {
    width: 20px;
    height: 20px;
  }

  .user-avatar {
    width: 30px;
    height: 30px;
  }
}

/* Containers */
.settings-container,
.user-auth-container {
    position: relative; /* Anchors dropdowns */
    display: inline-block;
}

/* Hidden utility class */
.hidden {
    display: none !important;
}

/* Hamburger button styles */
.hamburger-btn {
    display: none; /* Hidden by default on desktop */
    background: none;
    border: none;
    font-size: 32px;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px 12px;
    transition: all 0.3s ease;
    line-height: 1;
    border-radius: 6px;
}

.hamburger-btn:hover {
    background-color: var(--hover-bg);
    transform: scale(1.1);
}

.hamburger-btn:active {
    transform: scale(0.95);
}

/* Sign in/out button styles now handled by buttons.css */

.settings-button {
    background: none;
    border: none;
    padding: 10px;
    cursor: pointer;
    color: var(--text-color);
    transition: all 0.3s ease;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-button:hover {
    background-color: var(--hover-bg);
    transform: rotate(90deg);
}

.settings-button:active {
    transform: rotate(90deg) scale(0.9);
}

.gear-icon {
  width: 26px;
  height: 26px;
  opacity: 1;
  transform: rotate(45deg);
}

.gear-icon {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

/* User Button */
.user-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    padding: 4px 8px;
    cursor: pointer;
    color: var(--text-color);
    border-radius: 20px;
    transition: background-color 0.2s;
}

.user-button:hover {
    background-color: var(--hover-bg);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.username {
    font-weight: 500;
    color: var(--text-color);
}

/* ================= Dropdown Styles ================= */

/* Base dropdown */
.settings-dropdown,
.user-dropdown {
    position: absolute;
    top: calc(100% + 8px); /* Aligns below button */
    right: 0;
    min-width: 280px;
    background-color: var(--dropdown-bg);
    border: 1px solid var(--dropdown-border);
    border-radius: 12px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25), 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 1rem 1.25rem;
    z-index: 1000;
    color: var(--text-color);
    animation: slideDown 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

/* Hidden state toggled by JS */
.settings-dropdown.hidden,
.user-dropdown.hidden {
    display: none;
}

/* Settings dropdown content */
.settings-group {
    padding: 0.85rem 0;
    margin-bottom: 0.4rem;
    border-bottom: 1px solid var(--border-color);
    border-bottom: 1px solid rgba(155, 89, 182, 0.1);
    transition: all 0.2s ease;
}

.settings-group:last-child {
    margin-bottom: 0.4rem;
    border-bottom: none;
}

.settings-group h3 {
    margin: 0 0 0.75rem 0;
    font-size: 0.95rem;
    color: var(--accent-color);
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-size: 0.8rem;
    opacity: 0.9;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0.6rem 0;
    gap: 1rem;
    min-height: 38px;
}

.setting-item:first-child {
    margin-top: 0;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label,
.setting-item .setting-label {
    font-size: 0.92rem;
    margin: 0;
    font-weight: 500;
    color: var(--text-color);
    flex: 1;
    line-height: 1.3;
    display: flex;
    align-items: center;
}

.setting-item select {
    padding: 8px 12px;
    border-radius: 6px;
    border: 1.5px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
    min-width: 120px;
    height: 38px;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12"><path fill="%239b59b6" d="M6 9L1 4h10z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 32px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    flex-shrink: 0;
}

.setting-item select:hover {
    border-color: var(--accent-color);
    background-color: var(--hover-bg);
    box-shadow: 0 2px 4px rgba(155, 89, 182, 0.1);
}

.setting-item select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(155, 89, 182, 0.15);
}

/* Theme Toggle Switch */
.theme-toggle-container {
    position: relative;
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
}

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

.theme-toggle-label {
    display: block;
    width: 70px;
    height: 38px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    border: 2px solid var(--border-color);
    flex-shrink: 0;
}

.theme-toggle-label:hover {
    box-shadow: 0 4px 12px rgba(155, 89, 182, 0.3);
    transform: translateY(-1px);
}

.theme-toggle-slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 30px;
    height: 30px;
    background: white;
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.theme-icon {
    position: absolute;
    font-size: 16px;
    transition: all 0.3s ease;
}

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

.moon-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

/* Dark mode state - when checkbox is checked */
.theme-toggle-input:checked + .theme-toggle-label {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
}

.theme-toggle-input:checked + .theme-toggle-label .theme-toggle-slider {
    transform: translateX(32px);
}

.theme-toggle-input:checked + .theme-toggle-label .sun-icon {
    opacity: 0;
    transform: rotate(-180deg) scale(0);
}

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

/* Focus state for accessibility */
.theme-toggle-input:focus + .theme-toggle-label {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Font Size Controls */
.font-size-controls {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.font-size-btn {
    width: 38px;
    height: 38px;
    border: none;
    background: var(--input-bg);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.font-size-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-color), rgba(155, 89, 182, 0.8));
    opacity: 0;
    transition: opacity 0.25s ease;
}

.font-size-btn:hover::before {
    opacity: 0.15;
}

.font-size-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 12px rgba(155, 89, 182, 0.25);
}

.font-size-btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 6px rgba(155, 89, 182, 0.2);
}

.font-size-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

.font-size-btn:disabled::before {
    display: none;
}

.font-size-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

.font-size-icon {
    font-weight: 600;
    font-size: 16px;
    line-height: 1;
    position: relative;
    z-index: 1;
    transition: all 0.25s ease;
}

.font-size-icon sup {
    font-size: 13px;
    font-weight: 700;
    position: relative;
    top: -0.2em;
    margin-left: 1px;
}

.font-size-btn:hover .font-size-icon {
    color: var(--accent-color);
    transform: scale(1.1);
}

.font-size-btn:disabled .font-size-icon {
    transform: none;
}

.settings-footer {
    padding-top: 0.65rem;
    margin-top: 0.4rem;
    display: flex;
    gap: 0.5rem;
    border-top: 1px solid var(--border-color);
    border-top: 1px solid rgba(155, 89, 182, 0.15);
}

.settings-footer a {
    flex: 1;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 6px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.2s ease;
}

.settings-footer a:hover {
    background: var(--hover-bg);
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(155, 89, 182, 0.15);
}

/* User dropdown links */
.user-dropdown {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-width: 200px;
}

.user-dropdown a {
    color: var(--text-color);
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 0.92rem;
    font-weight: 500;
    border: 1px solid transparent;
}

.user-dropdown a:hover {
    background-color: var(--hover-bg);
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateX(3px);
    box-shadow: 0 2px 4px rgba(155, 89, 182, 0.1);
}

/* Sign-out button styles now handled by buttons.css */

/* ================= Responsive ================= */
@media (max-width: 768px) {
    .username {
        display: none;
    }

    .settings-dropdown,
    .user-dropdown {
        position: fixed;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        right: auto;
        width: calc(100% - 20px);
        max-width: 420px;
        border-radius: 16px 16px 0 0;
        max-height: 70vh;
        overflow-y: auto;
        top: auto;
        padding: 1.5rem;
    }

    .settings-dropdown:not(.hidden),
    .user-dropdown:not(.hidden) {
        animation: slideUp 0.45s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .settings-group {
        padding: 1.1rem;
    }
    
    .setting-item {
        margin: 0.8rem 0;
    }
    
    .setting-item select {
        min-width: 130px;
        padding: 8px 12px;
        font-size: 0.95rem;
    }
    
    .settings-footer {
        flex-direction: column;
        gap: 0.6rem;
    }
    
    .settings-footer a {
        padding: 10px 12px;
        font-size: 0.92rem;
    }
}

@media (max-width: 480px) {
    .settings-dropdown,
    .user-dropdown {
        width: calc(100% - 10px);
        max-height: 60vh;
    }
}

/* ================= Animations ================= */
@keyframes slideDown {
    from { transform: translateY(-10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateX(-50%) translateY(30px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

.settings-dropdown:not(.hidden),
.user-dropdown:not(.hidden) {
    animation: slideDown 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Smooth scrolling for mobile menu */
@media (prefers-reduced-motion: no-preference) {
    .nav-center {
        scroll-behavior: smooth;
    }
}