/* =============================================
   FlipG — Premium Dark Theme
   ============================================= */

:root {
    --bg-primary: #0a0a1a;
    --bg-card: rgba(15, 15, 35, 0.7);
    --bg-card-hover: rgba(20, 20, 45, 0.8);
    --border: rgba(99, 102, 241, 0.15);
    --border-hover: rgba(99, 102, 241, 0.35);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --purple: #a855f7;
    --green: #22c55e;
    --red: #ef4444;
    --glass: rgba(255, 255, 255, 0.03);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Background blobs */
.bg-effects {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, var(--purple) 0%, transparent 70%);
    bottom: -80px;
    left: -80px;
    animation-delay: -7s;
}

.blob-3 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, #0ea5e9 0%, transparent 70%);
    top: 50%;
    left: 50%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.1); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(40px, 30px) scale(1.05); }
}

/* Container */
.container {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 40px 20px 80px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeInUp 0.6s ease-out;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-light), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

/* Card */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
    transition: border-color var(--transition);
    animation: fadeInUp 0.6s ease-out both;
}

.card:hover {
    border-color: var(--border-hover);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.drop-zone.drag-over {
    transform: scale(1.01);
}

.upload-icon {
    color: var(--accent-light);
    margin-bottom: 16px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.drop-text {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 6px;
}

.drop-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.file-types {
    display: inline-block;
    padding: 4px 14px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    margin-top: 16px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    animation: fadeInUp 0.3s ease-out;
}

.file-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent-light);
    font-weight: 500;
    font-size: 0.95rem;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-icon:hover {
    border-color: var(--red);
    color: var(--red);
    background: rgba(239, 68, 68, 0.1);
}

/* Loading */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 24px;
    color: var(--text-secondary);
    animation: fadeInUp 0.3s ease-out;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Error */
.error-msg {
    padding: 16px 20px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    color: var(--red);
    font-size: 0.9rem;
    margin-top: 16px;
    animation: shake 0.4s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* Preview Section */
#preview-section {
    margin-top: 24px;
    animation: fadeInUp 0.6s ease-out both;
    animation-delay: 0.1s;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.preview-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

.data-stats {
    display: flex;
    gap: 12px;
}

.stat-badge {
    padding: 4px 14px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-total {
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--accent-light);
}

.stat-valid {
    border-color: rgba(34, 197, 94, 0.3);
    color: var(--green);
}

.stat-error {
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--red);
}

/* Sheet Tabs */
.sheet-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.sheet-tab {
    padding: 8px 20px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 8px 8px 0 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.sheet-tab:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.08);
}

.sheet-tab.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--accent);
    color: var(--accent-light);
    border-bottom-color: transparent;
}

/* Table */
.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    max-height: 500px;
    overflow-y: auto;
}

.table-wrapper::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.table-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.table-wrapper::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.table-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.data-table thead {
    position: sticky;
    top: 0;
    z-index: 2;
}

.data-table th {
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent-light);
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    white-space: nowrap;
    border-bottom: 2px solid var(--accent);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    white-space: nowrap;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-table tbody tr {
    transition: background var(--transition);
}

.data-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

.data-table tbody tr:nth-child(even) {
    background: var(--glass);
}

.data-table tbody tr:nth-child(even):hover {
    background: rgba(99, 102, 241, 0.07);
}

.row-num {
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 500;
    text-align: center;
    width: 40px;
    min-width: 40px;
}

/* GenMap Area */
.genmap-area {
    display: flex;
    justify-content: flex-end;
    padding-top: 24px;
    margin-top: 20px;
    border-top: 1px solid var(--border);
}

.btn-primary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 4px 20px var(--accent-glow);
    font-family: 'Inter', sans-serif;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Result Card */
#result-section {
    margin-top: 24px;
    animation: fadeInUp 0.6s ease-out both;
}

.result-card {
    text-align: center;
    padding: 40px 28px;
}

.result-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.result-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--green);
}

.key-display {
    max-width: 500px;
    margin: 0 auto;
}

.key-display label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

.key-box {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.key-box code {
    flex: 1;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.9rem;
    color: var(--accent-light);
    word-break: break-all;
    text-align: left;
}

.key-box .btn-icon:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(99, 102, 241, 0.1);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(-16px);
    }
}

/* Login Overlay */
.login-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    animation: fadeInUp 0.5s ease-out;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 36px;
    width: 380px;
    max-width: 90vw;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow), 0 0 60px rgba(99, 102, 241, 0.08);
    text-align: center;
}

.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 24px;
}

.login-logo span {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-light), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-card h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.input-group {
    text-align: left;
    margin-bottom: 18px;
}

.input-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: 'Inter', sans-serif;
    outline: none;
    transition: all var(--transition);
}

.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.login-error {
    padding: 10px 14px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: var(--red);
    font-size: 0.85rem;
    margin-bottom: 16px;
    animation: shake 0.4s ease-out;
}

.login-submit {
    width: 100%;
    justify-content: center;
    margin-top: 6px;
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 24px 16px 60px;
    }

    .card {
        padding: 20px;
    }

    .drop-zone {
        padding: 32px 16px;
    }

    .preview-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
    }
}