:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

/* Header */
.app-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1.5rem 1rem;
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.app-header .subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
}

.network-status {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
    font-size: 0.75rem;
}

.network-status.offline {
    background: rgba(239, 68, 68, 0.2);
}

/* Container & Layout */
.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Dashboard */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    border-top: 4px solid var(--primary-color);
}

.stat-card.success { border-color: var(--success); }
.stat-card.warning { border-color: var(--warning); }

.stat-title {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Main Content Grid */
.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 350px 1fr;
    }
}

/* Sections */
.form-section, .list-section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Form Styles */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.required {
    color: var(--danger);
}

input[type="text"], select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: #fff;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.error-message {
    display: none;
    color: var(--danger);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--danger);
}

.form-group.error .error-message {
    display: block;
}

.btn-submit {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 1rem;
}

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

.success-message {
    margin-top: 1rem;
    padding: 0.75rem;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border-radius: var(--radius);
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
}

.native-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn-secondary {
    border: 1px solid var(--border-color);
    background: #f8fafc;
    color: var(--text-main);
    padding: 0.65rem 0.5rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.8rem;
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.native-message,
.location-preview {
    margin-top: 0.75rem;
    padding: 0.65rem;
    border-radius: 4px;
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    font-size: 0.8rem;
}

.native-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.photo-preview {
    margin-top: 0.75rem;
}

.photo-preview img,
.survey-photo {
    display: block;
    width: 100%;
    max-height: 220px;
    object-fit: cover;
    border-radius: 4px;
}

.btn-link {
    margin-top: 0.35rem;
    padding: 0;
    border: 0;
    background: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 0.8rem;
}

.hidden {
    display: none;
}

/* Survey List */
.survey-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 0;
    font-size: 0.875rem;
}

/* Survey Card */
.survey-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1rem;
    transition: box-shadow 0.2s;
}

.survey-card:hover {
    box-shadow: var(--shadow-sm);
}

.survey-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.survey-user {
    font-weight: 600;
    color: var(--text-main);
}

.survey-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.survey-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
}

.detail-item span:first-child {
    color: var(--text-muted);
    margin-right: 0.25rem;
}

.detail-item span:last-child {
    font-weight: 500;
}

.survey-rating {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-color);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Rating colors */
.rating-rtot { color: #10b981; background-color: rgba(16, 185, 129, 0.1); }
.rating-tot { color: #3b82f6; background-color: rgba(59, 130, 246, 0.1); }
.rating-tb { color: #f59e0b; background-color: rgba(245, 158, 11, 0.1); }
.rating-kem { color: #ef4444; background-color: rgba(239, 68, 68, 0.1); }
.rating-rkem { color: #7f1d1d; background-color: rgba(127, 29, 29, 0.1); }

.survey-comment {
    font-size: 0.875rem;
    color: var(--text-main);
    background-color: var(--bg-color);
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.survey-location {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-bottom: 0.75rem;
}

.survey-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
}

.sync-status {
    font-size: 0.75rem;
    font-weight: 600;
}

.sync-status.synced { color: var(--success); }
.sync-status.pending { color: var(--warning); }
.sync-status.failed { color: var(--danger); }

.btn-delete {
    background: none;
    border: none;
    color: var(--danger);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: opacity 0.2s;
}

.btn-delete:hover {
    opacity: 0.8;
}

/* Install Button (A2HS) */
.btn-install {
    background-color: #f1f5f9;
    color: #2563eb;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    margin-top: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color 0.2s;
}
.btn-install:hover {
    background-color: #e2e8f0;
}
.hidden {
    display: none !important;
}