/* ==========================================
   iCalDrop - Main Stylesheet
   Modern, Premium Design System
   ========================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-primary-glow: rgba(99, 102, 241, 0.3);
    
    --color-secondary: #ec4899;
    --color-secondary-dark: #db2777;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Neutrals */
    --color-bg: #0f0f1a;
    --color-bg-elevated: #1a1a2e;
    --color-bg-card: #16162a;
    --color-bg-hover: #242444;
    
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-text-subtle: #64748b;
    
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-hero: linear-gradient(180deg, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
    --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, transparent 100%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px var(--color-primary-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-tooltip: 1100;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    position: relative;
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    pointer-events: none;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
    opacity: 0.5;
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.5; }
    50% { transform: translateX(-50%) scale(1.1); opacity: 0.3; }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.logo-icon {
    font-size: var(--font-size-3xl);
    filter: drop-shadow(0 0 10px var(--color-primary-glow));
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero h1 {
    font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    flex: 1;
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
}

/* ==========================================
   Cards
   ========================================== */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.creator-card {
    max-width: 700px;
    margin: 0 auto;
}

.card-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.card-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.card-header p {
    color: var(--color-text-muted);
}

/* ==========================================
   Form Styles
   ========================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="datetime-local"],
input[type="email"] {
    width: 100%;
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

input::placeholder {
    color: var(--color-text-subtle);
}

/* ==========================================
   Properties Section
   ========================================== */
.properties-section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.section-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.properties-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.property-item {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    position: relative;
    transition: all var(--transition-base);
}

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

.property-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.property-number {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.color-picker {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 0;
}

.remove-property-btn {
    background: none;
    border: none;
    color: var(--color-text-subtle);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: var(--font-size-lg);
    transition: color var(--transition-fast);
}

.remove-property-btn:hover {
    color: var(--color-error);
}

.property-fields {
    display: grid;
    gap: var(--spacing-md);
}

.property-fields input {
    margin-bottom: 0;
}

.validation-status {
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.validation-status.valid {
    color: var(--color-success);
}

.validation-status.invalid {
    color: var(--color-error);
}

.validation-status.validating {
    color: var(--color-warning);
}

/* ==========================================
   Settings Section
   ========================================== */
.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.settings-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Toggle Switch */
.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
}

.toggle-label input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--color-text-muted);
    border-radius: 50%;
    transition: all var(--transition-base);
}

.toggle-label input:checked + .toggle-slider {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.toggle-label input:checked + .toggle-slider::before {
    transform: translateX(20px);
    background: white;
}

.toggle-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.conditional-field {
    padding-left: calc(44px + var(--spacing-md));
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), 0 0 20px var(--color-primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px var(--color-primary-glow);
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
}

.btn-ghost:hover {
    color: var(--color-text);
    background: var(--color-bg-hover);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-base);
}

.btn-icon-only {
    padding: var(--spacing-sm);
    width: 40px;
    height: 40px;
}

.form-actions {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==========================================
   Modal
   ========================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--color-success);
    color: white;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

.modal-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.modal-body {
    margin-bottom: var(--spacing-lg);
}

.modal-body p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.share-link-box {
    display: flex;
    gap: var(--spacing-sm);
}

.share-link-box input {
    flex: 1;
    font-size: var(--font-size-sm);
}

.hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-subtle);
    text-align: center;
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: var(--spacing-sm);
    line-height: 1;
    transition: color var(--transition-fast);
}

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

/* ==========================================
   Footer
   ========================================== */
.footer {
    padding: var(--spacing-xl) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.footer strong {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ==========================================
   Password Gate
   ========================================== */
.password-gate {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    z-index: var(--z-modal);
}

.password-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    max-width: 400px;
    width: 100%;
    margin: var(--spacing-lg);
}

.password-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.password-card h2 {
    margin-bottom: var(--spacing-sm);
}

.password-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.error-text {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-md);
}

/* ==========================================
   Loading & Error States
   ========================================== */
.loading-state,
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--spacing-xl);
    text-align: center;
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-lg);
}

.error-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
}

.error-state h2 {
    margin-bottom: var(--spacing-md);
}

.error-state p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0 var(--spacing-xl);
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .modal-footer {
        flex-direction: column;
    }
    
    .share-link-box {
        flex-direction: column;
    }
}

/* ==========================================
   Saved Calendars Section
   ========================================== */
.saved-calendars-card {
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.saved-calendars-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.saved-calendar-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.saved-calendar-item:hover {
    border-color: var(--color-border-hover);
    background: var(--color-bg-hover);
}

.saved-calendar-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.saved-calendar-info strong {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.saved-calendar-meta {
    font-size: var(--font-size-xs);
    color: var(--color-text-subtle);
}

.saved-calendar-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .saved-calendar-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .saved-calendar-actions {
        width: 100%;
        justify-content: flex-start;
    }
}