/* ==========================================================================
   1. TOP APP BAR (Sticky Header)
   ========================================================================== */
.top-app-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background-color: transparent;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(128, 128, 128, 0.1);
    transition: transform 0.4s ease-in-out, opacity 0.4s ease-in-out;
}

.top-app-bar.hidden {
    transform: translateY(-150%);
    opacity: 0;
}

.app-bar-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.top-app-bar .logo {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
}

/* Buttons */
.icon-button,
.theme-toggle-button {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: auto;
    height: 35px;
    border-radius: 999px;
    border: none;
    background-color: transparent;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    transition: background-color 0.2s;
    padding: 0 0.75rem;
    text-decoration: none;
}

.icon-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-on-surface);
    white-space: nowrap;
}

.icon-button img,
.theme-toggle-button img {
    width: 25px;
    height: 25px;
}

/* ==========================================================================
   2. DROPDOWN MENU
   ========================================================================== */
.dropdown-container {
    position: relative;
}

/* Gradient Ring Animation */
#dropdown-toggle::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    padding: 2px;
    background: conic-gradient(from -60deg, #EA4335 0% 26%, #4285F4 26% 58%, #34A853 58% 84%, #FBBC05 84% 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    z-index: 0;
    opacity: 0;
    transition: transform 0.6s linear, opacity 0.3s ease-in-out;
}

#dropdown-toggle:hover::before {
    opacity: 1;
    transform: rotate(360deg);
}

#dropdown-toggle img {
    position: relative;
    z-index: 1;
}

/* Dropdown Card */
.dropdown-card {
    position: absolute;
    top: calc(100% + 9px);
    right: 0;
    z-index: 1001;
    width: max-content;
    background-color: var(--md-surface);
    border-radius: 12px;
    border: 1px solid var(--md-outline);
    box-shadow: 0 4px 12px var(--md-shadow-color);
    padding: 0.5rem;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, visibility 0.2s, transform 0.2s ease;
}

.dropdown-container:focus-within .dropdown-card {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Dropdown Items */
.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    text-decoration: none;
    color: var(--md-on-surface);
    background-color: transparent;
    border: none;
    width: 100%;
    cursor: pointer;
    text-align: left;
    font-size: 0.9rem;
    font-family: inherit;
    transition: background-color 0.2s ease;
}

.dropdown-item:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

body:not([data-theme='light']) .dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.menu-separator {
    border: none;
    height: 1px;
    background-color: #555560;
    margin: 4px 0;
}

.dropdown-icon {
    width: 20px;
    height: 20px;
    color: var(--md-on-surface-variant);
}

.dropdown-title {
    font-weight: 500;
}

/* ==========================================================================
   3. SETTINGS MODAL
   ========================================================================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s;
}

.modal-backdrop.open {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    background-color: var(--md-surface);
    width: 90%;
    max-width: 400px;
    border-radius: 24px;
    border: 1px solid var(--md-outline);
    box-shadow: 0 10px 40px var(--md-shadow-color);
    transform: scale(0.95);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

.modal-backdrop.open .modal-card {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--md-outline);
    background: var(--md-surface-variant);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
}

.modal-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.setting-label {
    display: block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    color: var(--md-on-surface-variant);
    margin-bottom: 0.75rem;
}

/* Controls (Segmented & Grid) */
.segmented-control {
    display: flex;
    background-color: var(--md-surface-variant);
    padding: 4px;
    border-radius: 12px;
    gap: 4px;
}

.segment-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px;
    border: none;
    background: transparent;
    color: var(--md-on-surface-variant);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}

.segment-btn:hover {
    color: var(--md-on-surface);
}

.segment-btn.active {
    background-color: var(--md-surface);
    color: var(--md-primary);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    font-weight: 700;
}

.theme-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.theme-card {
    background: transparent;
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 8px;
    cursor: pointer;
    text-align: center;
    transition: background 0.2s;
}

.theme-card:hover {
    background-color: var(--md-surface-variant);
}

.theme-card.active {
    background-color: var(--md-surface-variant);
    border-color: var(--md-primary);
}

.theme-card span {
    display: block;
    margin-top: 6px;
    font-size: 0.8rem;
    color: var(--md-on-surface);
}

.theme-preview {
    height: 40px;
    border-radius: 8px;
    width: 100%;
    margin-bottom: 4px;
    border: 1px solid var(--md-outline);
}

.default-preview {
    background: linear-gradient(135deg, #8ab4f8, #1967d2);
}

.md3-preview {
    background: linear-gradient(135deg, #e9b3ff, #4f2667);
}

.oled-preview {
    background: linear-gradient(135deg, #ffffff, #000000);
}

/* ==========================================================================
   4. DESKTOP & MOBILE NAVIGATION (Responsive Switcher)
   ========================================================================== */

/* A. Mobile Bottom Bar (Default) */
.navigation-bar {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    /* background-color: var(--md-surface-variant); */
    
    background-color: transparent;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(128, 128, 128, 0.1);
    transition: transform 0.4s ease-in-out, opacity 0.4s ease-in-out;

    padding: 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--md-outline);
    box-shadow: 0 4px 12px var(--md-shadow-color);
    transition: transform 0.4s ease-in-out, opacity 0.4s ease-in-out;
}

.navigation-bar.hidden {
    transform: translateX(-50%) translateY(200%);
    opacity: 0;
}

.navigation-bar .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--md-on-nav-variant);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    min-width: 50px;
    transition: background-color 0.3s, color 0.3s;
}

.navigation-bar .nav-item .icon {
    margin-bottom: 2px;
    display: flex;
    align-items: center;
}

.navigation-bar .nav-item .label {
    font-size: 0.75rem;
    font-weight: 500;
}

.navigation-bar .nav-item.active {
    color: var(--md-primary);
}

/* B. Desktop Top Bar (Default Hidden) */
.desktop-nav {
    display: none;
}

.desktop-nav .nav-item {
    text-decoration: none;
    color: var(--md-on-surface-variant);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
    position: relative;
}

.desktop-nav .nav-item:hover {
    color: var(--md-on-surface);
    background-color: rgba(0, 0, 0, 0.05);
}

body:not([data-theme='light']) .desktop-nav .nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.desktop-nav .nav-item.active {
    color: var(--md-primary);
}

.desktop-nav .nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0.5rem;
    right: 0.5rem;
    height: 2px;
    border-radius: 1px;
    background-color: var(--md-primary);
}

/* C. Responsive Switching Logic */
/* We use !important on Display properties to ensure this logic wins regardless of file load order */

@media (max-width: 768px) {
    .navigation-bar {
        display: flex !important;
        bottom: 1rem;
        padding: 0.5rem;
    }

    .desktop-nav {
        display: none !important;
    }
}

@media (min-width: 769px) {
    .navigation-bar {
        display: none !important;
    }

    .desktop-nav {
        display: flex !important;
        gap: 0.5rem;
        align-items: center;
    }
}