:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --border-color: #334155;
    --border-hover: #6366f1;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --success-color: #10b981;
    --error-color: #ef4444;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-logo {
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    letter-spacing: 0.5px;
    text-decoration: none;
    display: inline-block;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.brand-logo:hover {
    transform: scale(1.04);
    opacity: 0.95;
    color: white;
}

.brand-info h1 {
    font-size: 1.1rem;
    font-weight: 600;
}

.badge {
    font-size: 0.75rem;
    color: #a855f7;
    background-color: rgba(168, 85, 247, 0.1);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    border: 1px solid rgba(168, 85, 247, 0.3);
    text-decoration: none;
    display: inline-block;
    cursor: pointer;
    transition: all 0.2s ease;
}

.badge:hover {
    background-color: rgba(168, 85, 247, 0.25);
    color: #c084fc;
    border-color: rgba(168, 85, 247, 0.5);
}

.status-tag {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.05);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

/* Content Area */
.content-area {
    flex: 1;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Drop Section */
.drop-section {
    width: 100%;
    max-width: 680px;
}

.drop-card {
    background-color: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 3.5rem 2rem;
    text-align: center;
    transition: all 0.25s ease-in-out;
    cursor: pointer;
    position: relative;
}

.drop-card:hover, .drop-card.drag-over {
    border-color: var(--border-hover);
    background-color: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(99, 102, 241, 0.15);
}

.file-input {
    display: none;
}

.drop-icon {
    color: var(--accent-color);
    margin-bottom: 1.2rem;
}

.drop-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.drop-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.8rem;
}

.btn-browse {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.8rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-browse:hover {
    background-color: var(--accent-hover);
}

/* Loading */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Viewer Section */
.viewer-section {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-card);
    padding: 0.8rem 1.2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.file-meta {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.file-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.doc-badge {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.3);
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

.viewer-toolbar {
    display: flex;
    gap: 0.8rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    border: none;
}

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

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

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--text-secondary);
}

.btn-sefin {
    background-color: rgba(16, 185, 129, 0.15);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.4);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.btn-sefin:hover {
    background-color: rgba(16, 185, 129, 0.3);
    border-color: #10b981;
    color: #34d399;
}

.iframe-wrapper {
    flex: 1;
    background-color: #525659;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Error Banner */
.error-banner {
    position: absolute;
    bottom: 2rem;
    background-color: #ef444415;
    border: 1px solid var(--error-color);
    color: #f87171;
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    max-width: 600px;
}

.btn-close-error {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.1rem;
    cursor: pointer;
    margin-left: auto;
}

.hidden {
    display: none !important;
}

/* Footer */
.footer {
    text-align: center;
    padding: 0.8rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}