/* ============================
   CSS Değişkenleri & Reset
   ============================ */
:root {
    --color-bg: #f0f2f5;
    --color-surface: #ffffff;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    --color-toolbar: #1e293b;
    --color-toolbar-text: #e2e8f0;
    --color-tab-active: #ffffff;
    --color-tab-inactive: #475569;
    --color-tab-hover: #334155;
    --color-sidebar-bg: #ffffff;
    --color-overlay: rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --toolbar-height: 48px;
    --sidebar-width: 300px;
    --transition: 0.2s ease;
}

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

html {
    font-size: 15px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

button {
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ============================
   App Container
   ============================ */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* ============================
   Toolbar
   ============================ */
.toolbar {
    display: flex;
    align-items: center;
    height: var(--toolbar-height);
    background: var(--color-toolbar);
    color: var(--color-toolbar-text);
    padding: 0 8px;
    gap: 8px;
    flex-shrink: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
    user-select: none;
}

.hamburger-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-toolbar-text);
    font-size: 1.3rem;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
    flex-shrink: 0;
}
.hamburger-btn:hover {
    background: rgba(255,255,255,0.1);
}

.hamburger-icon {
    display: block;
}

/* Sekme Konteyneri */
.tabs-container {
    display: flex;
    align-items: stretch;
    gap: 2px;
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.2) transparent;
    height: 100%;
    -webkit-overflow-scrolling: touch;
}
.tabs-container::-webkit-scrollbar {
    height: 3px;
}
.tabs-container::-webkit-scrollbar-track {
    background: transparent;
}
.tabs-container::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.25);
    border-radius: 10px;
}

.tabs-empty {
    display: flex;
    align-items: center;
    color: var(--color-tab-inactive);
    padding: 0 16px;
    font-size: 0.85rem;
    white-space: nowrap;
    opacity: 0.7;
}

/* Tek Sekme */
.tab-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--color-tab-inactive);
    color: #cbd5e1;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    cursor: pointer;
    white-space: nowrap;
    font-size: 0.85rem;
    min-width: 0;
    max-width: 200px;
    transition: background var(--transition), color var(--transition);
    position: relative;
    flex-shrink: 0;
    border: none;
}
.tab-item:hover {
    background: var(--color-tab-hover);
    color: #f1f5f9;
}
.tab-item.active {
    background: var(--color-tab-active);
    color: var(--color-text);
    font-weight: 500;
    box-shadow: 0 -2px 6px rgba(0,0,0,0.08);
}
.tab-item.drag-over {
    border-left: 3px solid var(--color-primary);
}

.tab-title {
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
    pointer-events: none;
}

.tab-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: inherit;
    font-size: 0.8rem;
    opacity: 0.6;
    transition: opacity var(--transition), background var(--transition);
    flex-shrink: 0;
    line-height: 1;
}
.tab-close:hover {
    opacity: 1;
    background: rgba(0,0,0,0.15);
}
.tab-item.active .tab-close:hover {
    background: rgba(0,0,0,0.1);
}

.toolbar-spacer {
    flex: 0 0 auto;
}

/* ============================
   Main Layout (Sidebar + Content)
   ============================ */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ============================
   Sidebar Overlay (Mobil)
   ============================ */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    z-index: 90;
}
.sidebar-overlay.active {
    display: block;
}

/* ============================
   Sidebar
   ============================ */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--color-sidebar-bg);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    z-index: 95;
    transition: transform var(--transition);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}
.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

/* Arama */
.search-box {
    padding: 10px 14px;
    flex-shrink: 0;
}
.search-input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: #f8fafc;
}
.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
    background: #fff;
}

/* Bookmark Listesi */
.bookmarks-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px 10px;
}

.bookmark-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    border: 1px solid transparent;
    margin-bottom: 2px;
}
.bookmark-item:hover {
    background: #f1f5f9;
    border-color: var(--color-border);
}
.bookmark-item:active {
    background: #e2e8f0;
}

.bookmark-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.bookmark-info {
    flex: 1;
    min-width: 0;
}
.bookmark-title {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.bookmark-url {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.bookmark-category {
    display: inline-block;
    font-size: 0.7rem;
    background: #e2e8f0;
    color: var(--color-text-secondary);
    padding: 1px 7px;
    border-radius: 10px;
    margin-top: 3px;
}

.bookmark-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity var(--transition);
}
.bookmark-item:hover .bookmark-actions {
    opacity: 1;
}

.bookmark-actions button {
    background: none;
    border: none;
    font-size: 0.85rem;
    padding: 3px 6px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color var(--transition), background var(--transition);
}
.bookmark-actions button:hover {
    color: var(--color-text);
    background: rgba(0,0,0,0.06);
}
.bookmark-actions .btn-delete:hover {
    color: var(--color-danger);
}

.loading-placeholder,
.no-results {
    text-align: center;
    padding: 30px;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* ============================
   Content Area
   ============================ */
.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #fff;
    position: relative;
    min-width: 0;
}

.welcome-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--color-text-secondary);
}
.welcome-content {
    max-width: 400px;
}
.welcome-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}
.welcome-screen h1 {
    font-size: 1.6rem;
    color: var(--color-text);
    margin-bottom: 8px;
}
.welcome-screen p {
    font-size: 0.95rem;
    margin-bottom: 6px;
}
.welcome-hint {
    font-size: 0.8rem !important;
    opacity: 0.7;
}

/* iframe'lerin konteyneri */
.iframes-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background: #fff;
}

/* Her bir sekme için iframe sarmalayıcı */
.iframe-tab-wrapper {
    display: none;
    flex-direction: column;
    position: absolute;
    inset: 0;
}
.iframe-tab-wrapper.active {
    display: flex;
}

.iframe-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 14px;
    background: #f8fafc;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.8rem;
    flex-shrink: 0;
    gap: 10px;
}
.iframe-url-display {
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}
.iframe-direct-link {
    white-space: nowrap;
    font-weight: 500;
    flex-shrink: 0;
}

.main-iframe {
    flex: 1;
    border: none;
    width: 100%;
    background: #fff;
}

.iframe-error-msg {
    padding: 10px 14px;
    background: #fef3c7;
    color: #92400e;
    font-size: 0.82rem;
    text-align: center;
    flex-shrink: 0;
    border-top: 1px solid #fcd34d;
}
.iframe-error-msg a {
    font-weight: 600;
    color: #92400e;
}

/* ============================
   Butonlar
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: background var(--transition), transform 0.1s;
}
.btn:active {
    transform: scale(0.97);
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--color-primary-hover);
}
.btn-secondary {
    background: #e2e8f0;
    color: var(--color-text);
}
.btn-secondary:hover {
    background: #cbd5e1;
}
.btn-danger {
    background: var(--color-danger);
    color: #fff;
}
.btn-danger:hover {
    background: var(--color-danger-hover);
}
.btn-sm {
    padding: 5px 12px;
    font-size: 0.8rem;
}

/* ============================
   Modal
   ============================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    animation: fadeIn 0.2s;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 520px;
    max-height: 85vh;
    overflow-y: auto;
    animation: slideUp 0.25s;
}
.modal-sm {
    max-width: 380px;
}
@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}
.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}
.modal-close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    padding: 0 4px;
    line-height: 1;
    transition: color var(--transition);
}
.modal-close-btn:hover {
    color: var(--color-text);
}

.modal-form {
    padding: 16px 20px 20px;
}
.form-group {
    margin-bottom: 14px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--color-text);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 8px;
}

.confirm-message {
    padding: 20px;
    font-size: 0.95rem;
    color: var(--color-text);
}

/* ============================
   Responsive (Mobil)
   ============================ */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
    }
    
    .hamburger-btn {
        display: inline-flex;
    }
    
    .sidebar {
        position: fixed;
        top: var(--toolbar-height);
        left: 0;
        bottom: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 95;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    
    .tab-item {
        max-width: 140px;
        font-size: 0.8rem;
        padding: 6px 10px;
    }
    .tab-title {
        max-width: 80px;
    }
    
    .bookmark-actions {
        opacity: 1;
    }
}

@media (max-width: 480px) {
    .tab-item {
        max-width: 110px;
        font-size: 0.75rem;
        padding: 5px 8px;
    }
    .tab-title {
        max-width: 60px;
    }
    .modal {
        width: 95%;
        max-width: none;
        margin: 10px;
        border-radius: var(--radius-md);
    }
}
/* Adres çubuğu input */
.iframe-url-input {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.8rem;
    background: #fff;
    color: var(--color-text);
    outline: none;
    min-width: 0;
}
.iframe-url-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(37,99,235,0.1);
}
.iframe-new-tab-btn {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    padding: 2px 6px;
    line-height: 1;
    color: var(--color-text-secondary);
    transition: background var(--transition);
}
.iframe-new-tab-btn:hover {
    background: var(--color-bg);
}

.retry-proxy-btn {
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 4px 10px;
    margin-left: 6px;
    cursor: pointer;
    font-size: 0.8rem;
}
.retry-proxy-btn:hover {
    background: var(--color-primary-hover);
}
.iframe-new-tab-btn {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    padding: 2px 6px;
    color: var(--color-text-secondary);
}
.iframe-new-tab-btn:hover { background: var(--color-bg); }
.iframe-error-msg { /* zaten var */ }