/* ===== CSS RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --accent-color: #f59e0b;
    
    /* Background Colors */
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-glass: rgba(255, 255, 255, 0.1);
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #e2e8f0;
    --text-muted: #94a3b8;
    --text-accent: #fbbf24;
    
    /* Border Colors */
    --border-primary: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.05);
    --border-accent: rgba(99, 102, 241, 0.3);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Layout */
    --header-height: 60px;
    --header-height-min: 8px;
    --max-width: 1200px;
}

/* ===== GLOBAL STYLES ===== */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    background-attachment: fixed;
    background-size: 400% 400%;
    animation: gradientShift 20s ease infinite;
    overflow-x: hidden;
    line-height: 1.6;
    font-weight: 400;
}

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

.hidden {
    display: none !important;
}

/* ===== UTILITY CLASSES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg-glass);
    border-color: var(--border-accent);
    transform: translateY(-1px);
}

/* ===== AUTHENTICATION OVERLAY ===== */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(20px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.logo-icon {
    font-size: 2rem;
    color: var(--primary-color);
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.logo-text {
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.auth-form {
    margin-bottom: var(--spacing-2xl);
}

.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.input-label i {
    color: var(--primary-color);
}

.auth-input {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all var(--transition-normal);
}

.auth-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.auth-input::placeholder {
    color: var(--text-muted);
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    min-height: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.auth-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.auth-features {
    display: flex;
    justify-content: space-around;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-primary);
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.75rem;
}

.feature-item i {
    font-size: 1rem;
    color: var(--primary-color);
}

/* ===== MAIN APPLICATION ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER ===== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height-min);
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(20px);
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-lg);
    transition: all var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.app-header:hover {
    height: var(--header-height);
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border-primary);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.header-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    padding: var(--spacing-sm);
    cursor: pointer;
    border-radius: 50%;
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-header:hover .header-btn,
.app-header:hover .user-info {
    opacity: 1;
    visibility: visible;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.user-email {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.logout-btn {
    background: none;
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.logout-btn:hover {
    background: var(--bg-glass);
    border-color: var(--border-accent);
}

/* ===== DASHBOARD ===== */
.dashboard {
    width: 100%;
    min-height: 100vh;
    padding: calc(var(--header-height) + var(--spacing-xl)) var(--spacing-lg) var(--spacing-xl);
}

.dashboard-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.dashboard-header {
    margin-bottom: var(--spacing-2xl);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.dashboard-logo {
    font-size: 2rem;
    color: var(--primary-color);
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.dashboard-title {
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.continue-btn {
    background: linear-gradient(135deg, var(--accent-color), #f97316);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-glow);
}

.continue-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
}

.dashboard-content {
    display: grid;
    gap: var(--spacing-2xl);
}

.content-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

.dashboard-section {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.dashboard-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.section-header {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-title i {
    color: var(--primary-color);
}

.section-description {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== SOURCES GRID ===== */
.sources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.source-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.source-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.source-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-accent);
    box-shadow: var(--shadow-lg);
}

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

.source-card .favicon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.source-card .item-name {
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

/* ===== LIBRARY SECTION ===== */
.add-bookmark-container {
    margin-bottom: var(--spacing-xl);
}

.add-bookmark-form {
    display: flex;
    gap: var(--spacing-sm);
}

.input-wrapper {
    position: relative;
    flex: 1;
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    z-index: 1;
}

.bookmark-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) calc(var(--spacing-md) * 2 + 16px);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all var(--transition-normal);
}

.bookmark-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.bookmark-input::placeholder {
    color: var(--text-muted);
}

.add-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.add-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.library-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.library-item {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.library-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(236, 72, 153, 0.05));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.library-item:hover {
    transform: translateY(-2px);
    border-color: var(--border-accent);
    box-shadow: var(--shadow-md);
}

.library-item:hover::before {
    opacity: 1;
}

.library-item-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    flex: 1;
    position: relative;
    z-index: 1;
}

.library-item .favicon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.library-item .item-name {
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: all var(--transition-normal);
    opacity: 0;
    position: relative;
    z-index: 1;
}

.library-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

/* ===== READER VIEW ===== */
.reader-container {
    height: 100vh;
    padding-top: var(--header-height-min);
    transition: padding-top var(--transition-normal);
}

.reader-frame {
    width: 100%;
    height: 100%;
    border: none;
    background: white;
}

/* ===== LOADING SPINNER ===== */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    gap: var(--spacing-xl);
}

.sharingan-loader {
    position: relative;
    width: 140px;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

.sharingan-loader::before {
    content: '';
    position: absolute;
    top: -12px;
    left: -12px;
    right: -12px;
    bottom: -12px;
    border: 2px solid transparent;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--accent-color)) border-box;
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: destination-out;
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    animation: rotate 3s linear infinite;
    pointer-events: none;
}

.sharingan-gif {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border-radius: 50%;
    box-shadow: 0 0 20px 4px rgba(239, 68, 68, 0.3);
    background: transparent;
    display: block;
}

@media (max-width: 600px) {
    .sharingan-loader {
        width: 90px;
        height: 90px;
    }
    .sharingan-gif {
        width: 70px;
        height: 70px;
    }
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1);
        box-shadow: 0 0 30px rgba(99, 102, 241, 0.3);
    }
    50% { 
        transform: scale(1.05);
        box-shadow: 0 0 50px rgba(99, 102, 241, 0.5);
    }
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    animation: fadeInOut 2s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* ===== FULLSCREEN MODE ===== */
body:fullscreen .app-header {
    display: none;
}

body:fullscreen .reader-container {
    padding-top: 0;
}

body:fullscreen {
    background: #000;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .dashboard {
        padding: calc(var(--header-height) + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .sources-grid {
        grid-template-columns: 1fr;
    }
    
    .add-bookmark-form {
        flex-direction: column;
    }
    
    .app-header {
        height: var(--header-height);
        background: var(--bg-glass);
        border-bottom: 1px solid var(--border-primary);
    }
    
    .header-btn,
    .user-info {
        opacity: 1 !important;
        visibility: visible !important;
    }
    
    .auth-card {
        padding: var(--spacing-xl);
    }
    
    .dashboard-section {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: var(--spacing-md);
    }
    
    .dashboard {
        padding: calc(var(--header-height) + var(--spacing-md)) var(--spacing-sm) var(--spacing-md);
    }
    
    .header-content {
        padding: var(--spacing-lg);
    }
    
    .dashboard-section {
        padding: var(--spacing-md);
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dashboard-section {
    animation: fadeInUp 0.6s ease forwards;
}

.dashboard-section:nth-child(2) {
    animation-delay: 0.1s;
}

.source-card,
.library-item {
    animation: fadeInUp 0.4s ease forwards;
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-accent);
}