/* Root Variables */
:root {
    --primary: #3498db;
    --secondary: #2c3e50;
    --success: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --dark: #34495e;
    --light: #ecf0f1;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --radius: 12px;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
}

#app {
    max-width: 600px;
    margin: 0 auto;
    padding-bottom: 20px;
    background: var(--white);
    min-height: 100vh;
}

/* Header */
.app-header {
    background: var(--secondary);
    color: var(--white);
    padding: 20px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.btn-install,
.btn-settings {
    background: rgba(255,255,255,0.2);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.btn-install:hover,
.btn-settings:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

/* Settings Panel */
.settings-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 90%;
    max-width: 400px;
    height: 100vh;
    background: var(--white);
    box-shadow: -2px 0 10px rgba(0,0,0,0.1);
    transition: right 0.3s;
    z-index: 1000;
    overflow-y: auto;
}

.settings-panel.open {
    right: 0;
}

.settings-content {
    padding: 20px;
}

.settings-content h3 {
    color: var(--secondary);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--dark);
    font-weight: 500;
    margin-bottom: 5px;
}

.setting-item select {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--light);
    border-radius: 8px;
    background: var(--white);
    color: var(--dark);
    font-size: 1rem;
}

.subscription-url {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.subscription-url input {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--light);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--dark);
}

.subscription-url button {
    padding: 10px 15px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.help-text {
    display: block;
    color: #7f8c8d;
    font-size: 0.85rem;
    margin-top: 5px;
}

.btn-close {
    width: 100%;
    padding: 12px;
    background: var(--secondary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    margin-top: 20px;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    padding: 15px;
    gap: 10px;
    overflow-x: auto;
    background: #f8f9fa;
}

.tab-btn {
    background: var(--white);
    border: 2px solid var(--light);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s;
    color: var(--dark);
    font-weight: 500;
}

.tab-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* Events List */
.events-list {
    padding: 15px;
}

.event-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.3s;
    border-left: 4px solid var(--primary);
}

.event-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.event-card.past {
    opacity: 0.6;
    border-left-color: var(--light);
}

.event-card.today {
    border-left-color: var(--success);
    background: linear-gradient(to right, rgba(39, 174, 96, 0.05), transparent);
}

.event-card.soon {
    border-left-color: var(--warning);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.event-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 10px;
}

.event-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary);
}

.event-time {
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 500;
}

.event-countdown {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    margin-top: 10px;
}

.event-notes {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-top: 8px;
    line-height: 1.4;
}

.event-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.btn-small {
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s;
}

.btn-calendar {
    background: var(--primary);
    color: var(--white);
}

.btn-reminder {
    background: var(--success);
    color: var(--white);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--white);
    padding: 25px;
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideUp 0.3s;
}

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-content h2 {
    color: var(--secondary);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.close {
    float: right;
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
    line-height: 20px;
}

.close:hover {
    color: var(--dark);
}

#modalDetails {
    margin-bottom: 20px;
    line-height: 1.8;
}

.modal-actions {
    border-top: 1px solid var(--light);
    padding-top: 20px;
}

.reminder-settings {
    display: flex;
    gap: 15px;
    align-items: center;
    margin-bottom: 15px;
}

.reminder-settings label {
    display: flex;
    align-items: center;
    gap: 8px;
}

.reminder-settings select {
    flex: 1;
    padding: 8px;
    border: 2px solid var(--light);
    border-radius: 6px;
}

.btn-primary,
.btn-secondary {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 10px;
    transition: all 0.3s;
}

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

.btn-secondary {
    background: var(--success);
    color: var(--white);
}

.btn-primary:hover,
.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: #7f8c8d;
    font-size: 1.1rem;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    margin-left: 10px;
    border: 3px solid var(--primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Offline Indicator */
.offline-indicator {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--warning);
    color: var(--white);
    padding: 10px 20px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    z-index: 3000;
    animation: slideUp 0.3s;
}

/* Responsive */
@media (max-width: 480px) {
    .app-header h1 {
        font-size: 1.2rem;
    }
    
    .filter-tabs {
        padding: 10px;
    }
    
    .event-card {
        padding: 12px;
    }
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
}

/* PWA Install Banner */
.install-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--secondary);
    color: var(--white);
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transform: translateY(100%);
    transition: transform 0.3s;
    z-index: 1000;
}

.install-banner.show {
    transform: translateY(0);
}

.install-banner button {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
}

/* Checkbox Styling */
input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--secondary);
    color: var(--white);
    padding: 12px 24px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    z-index: 4000;
    animation: slideUp 0.3s;
    display: none;
}

.toast.show {
    display: block;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--danger);
}