/* CSS Variables for Dark/Light Mode */
:root[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-panel: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.4);
    
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;

    --panel-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

:root[data-theme="dark"] {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-panel: #1f2937;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    
    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.5);
    
    --success-color: #10b981;
    --warning-color: #fbbf24;
    --danger-color: #ef4444;

    --panel-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

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

.hidden {
    display: none !important;
}

html {
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    width: 100%;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 3rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--panel-shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--accent-primary);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lang-toggle {
    display: flex;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
}

.lang-btn {
    background: none;
    border: none;
    padding: 0.4rem 1rem;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn.active {
    background: var(--accent-primary);
    color: #fff;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: color 0.2s;
}

.theme-toggle:hover {
    color: var(--accent-primary);
}

/* Main Layout */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
    width: 100%;
}

.hero-section {
    text-align: center;
    margin-bottom: 3rem;
}

.hero-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, var(--accent-primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    height: calc(100vh - 250px);
    min-height: 600px;
}

@media (max-width: 992px) {
    .workspace {
        grid-template-columns: 1fr;
        height: auto;
    }
}

/* Panels */
.panel {
    background: var(--bg-panel);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--panel-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.panel-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.stats {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dot-separator {
    color: var(--border-color);
}

/* Editor */
#source-text {
    flex: 1;
    width: 100%;
    padding: 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.6;
    resize: none;
}

#source-text:focus {
    outline: none;
}

/* Options */
.panel-options {
    padding: 0.75rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.5rem;
}

.option-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-options label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-select {
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-panel);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.form-select:focus {
    border-color: var(--accent-primary);
}

.panel-actions {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    background-color: var(--bg-secondary);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
    box-shadow: 0 4px 14px 0 var(--accent-glow);
    flex: 2;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background-color: var(--bg-panel);
    border-color: var(--text-secondary);
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    transition: color 0.2s;
}

.btn-icon:hover {
    color: var(--accent-primary);
}

/* Results Panel */
.results-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: 100%;
}

.detection-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 2rem;
}

.detection-card.hidden {
    display: none;
}

.detection-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    min-width: 120px;
}

/* Radial Progress CSS */
.radial-progress {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: conic-gradient(var(--danger-color) calc(var(--progress) * 1%), var(--bg-secondary) 0);
    display: flex;
    align-items: center;
    justify-content: center;
}

.radial-progress::before {
    content: "";
    position: absolute;
    width: 66px;
    height: 66px;
    background-color: var(--bg-panel);
    border-radius: 50%;
}

.progress-text {
    position: relative;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.detection-summary {
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.detection-summary strong {
    color: var(--text-primary);
}

.output-card {
    flex: 1;
}

.output-content {
    padding: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
    overflow-y: auto;
    white-space: pre-wrap;
    flex: 1;
}

.placeholder-text {
    color: var(--text-secondary);
    font-style: italic;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    justify-content: center; align-items: center;
    z-index: 1000;
    color: white;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Auth Modal Styles */
.auth-modal {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.auth-modal.hidden {
    display: none !important;
}

.auth-modal-content {
    background: var(--bg-panel);
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    padding: 2.5rem;
    position: relative;
    border: 1px solid var(--border-color);
}

.auth-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.auth-box {
    display: flex;
    flex-direction: column;
}

.auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}

.auth-divider::before {
    content: "";
    position: absolute;
    left: 0; top: 50%; width: 100%; height: 1px;
    background: var(--border-color);
}

.auth-divider span {
    background: var(--bg-panel);
    padding: 0 10px;
    color: var(--text-secondary);
    position: relative;
    font-size: 0.9rem;
}

.auth-form-group {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
}

.auth-form-group label {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-form-group input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem;
    border-radius: 6px;
    font-family: inherit;
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .app-header {
        padding: 1rem;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        gap: 0;
    }
    .mobile-menu-btn {
        display: block;
    }
    .header-controls {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        padding-top: 1.5rem;
        border-top: 1px solid var(--border-color);
        margin-top: 1rem;
    }
    .header-controls.show {
        display: flex;
    }
    #user-info {
        margin-right: 0 !important;
        flex-direction: column;
        width: 100%;
    }
    #btn-open-login {
        margin-right: 0 !important;
        width: 100%;
    }
    .lang-toggle {
        margin-left: 0 !important;
    }
    .container {
        padding: 1rem;
    }
    .panel-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .panel-actions {
        flex-direction: column;
    }
    .btn {
        width: 100%;
    }
    .detection-card {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    .hero-section h2 {
        font-size: 2rem;
    }
}