/* Period42 - Design System CSS
 * Mobile-first, anonymous-first experience
 */

/* ==========================================
   CSS Variables / Design Tokens
   ========================================== */
:root {
    /* Colors - Primary */
    --color-primary: #ff69b4;
    --color-primary-dark: #ff1493;
    --color-primary-light: #ffb6c1;
    --color-primary-subtle: #fff0f5;

    /* Colors - Secondary */
    --color-secondary: #667eea;
    --color-secondary-dark: #5a67d8;
    --color-secondary-light: #a5b4fc;

    /* Colors - Semantic */
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-info: #3b82f6;
    --color-info-light: #dbeafe;

    /* Colors - Neutral */
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    --color-text: #1f2937;
    --color-text-secondary: #4b5563;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;

    /* Flow Level Colors */
    --flow-1: #fce7f3;
    --flow-2: #fbcfe8;
    --flow-3: #f9a8d4;
    --flow-4: #f472b6;
    --flow-5: #ec4899;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;

    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Borders */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-toast: 400;

    /* Layout */
    --header-height: 56px;
    --bottom-nav-height: 64px;
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior: none;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

/* Focus styles */
:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ==========================================
   App Shell Layout
   ========================================== */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

/* ==========================================
   Header
   ========================================== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: calc(var(--header-height) + var(--safe-area-top));
    padding-top: var(--safe-area-top);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-inverse);
    z-index: var(--z-sticky);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: var(--text-xl);
}

.logo-text {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    letter-spacing: -0.02em;
}

/* Menu Button (Hamburger) */
.menu-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    gap: 5px;
    padding: 10px;
}

.menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text-inverse);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================
   Dropdown Menu
   ========================================== */
.dropdown-menu {
    position: fixed;
    top: calc(var(--header-height) + var(--safe-area-top));
    right: var(--space-md);
    width: 200px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-sm);
    z-index: var(--z-dropdown);
    animation: slideDown var(--transition-fast);
}

.dropdown-menu[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: var(--transition-fast);
}

.menu-item:hover, .menu-item.active {
    background: var(--color-primary-subtle);
    color: var(--color-primary-dark);
}

.menu-item.premium {
    background: linear-gradient(135deg, var(--color-secondary-light) 0%, var(--color-primary-light) 100%);
    color: var(--color-secondary-dark);
}

.menu-icon {
    font-size: var(--text-lg);
}

.menu-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-sm) 0;
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    flex: 1;
    margin-top: calc(var(--header-height) + var(--safe-area-top));
    margin-bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom));
    padding: var(--space-md);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* ==========================================
   Bottom Navigation
   ========================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(var(--bottom-nav-height) + var(--safe-area-bottom));
    padding-bottom: var(--safe-area-bottom);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: var(--z-sticky);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: var(--transition-fast);
    position: relative;
}

.nav-item.active {
    color: var(--color-primary);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.nav-icon {
    font-size: var(--text-xl);
}

.nav-label {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
}

/* ==========================================
   Loading Spinner
   ========================================== */
.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
}

.loading-spinner[hidden] {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==========================================
   Modal / Bottom Sheet
   ========================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: var(--z-modal);
    animation: fadeIn var(--transition-fast);
}

.modal-overlay[hidden] {
    display: none;
}

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

.modal-content {
    background: var(--color-surface);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: var(--space-lg);
    padding-bottom: calc(var(--space-lg) + var(--safe-area-bottom));
    overflow-y: auto;
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Modal handle for swipe gestures */
.modal-handle {
    width: 40px;
    height: 4px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    margin: 0 auto var(--space-lg);
}

/* ==========================================
   Toast Notifications
   ========================================== */
.toast-container {
    position: fixed;
    top: calc(var(--header-height) + var(--safe-area-top) + var(--space-md));
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    pointer-events: none;
}

.toast {
    background: var(--color-text);
    color: var(--color-text-inverse);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(-20px);
    transition: var(--transition-base);
    pointer-events: auto;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast-success { background: var(--color-success); }
.toast-error { background: var(--color-error); }
.toast-warning { background: var(--color-warning); color: var(--color-text); }
.toast-info { background: var(--color-info); }

/* ==========================================
   Offline Indicator
   ========================================== */
.offline-indicator {
    position: fixed;
    top: calc(var(--header-height) + var(--safe-area-top) + var(--space-md));
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-warning);
    color: var(--color-text);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: var(--shadow-md);
    z-index: var(--z-toast);
}

.offline-indicator[hidden] {
    display: none;
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    line-height: 1;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    min-height: 48px;
    min-width: 48px;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-inverse);
    box-shadow: 0 4px 14px rgba(255, 105, 180, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(255, 105, 180, 0.4);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

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

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

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    min-height: 36px;
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--text-lg);
    min-height: 56px;
}

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

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    font-size: var(--text-base);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

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

textarea.form-input {
    resize: vertical;
    min-height: 100px;
}

/* Toggle Switch */
.toggle {
    position: relative;
    width: 52px;
    height: 32px;
    cursor: pointer;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--color-border);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 26px;
    width: 26px;
    left: 3px;
    bottom: 3px;
    background: var(--color-surface);
    border-radius: 50%;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

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

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

/* ==========================================
   Cards
   ========================================== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.card-body {
    padding: var(--space-lg);
}

.card-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--color-border-light);
    background: var(--color-bg);
}

/* ==========================================
   Calendar Styles
   ========================================== */
.calendar {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-inverse);
}

.calendar-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
}

.calendar-nav {
    display: flex;
    gap: var(--space-sm);
}

.calendar-nav-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    transition: var(--transition-fast);
}

.calendar-nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    padding: var(--space-md);
    background: var(--color-bg);
}

.calendar-weekday {
    text-align: center;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    padding: var(--space-sm);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    min-height: 44px;
}

.calendar-day:hover {
    background: var(--color-bg);
}

.calendar-day.other-month {
    color: var(--color-text-muted);
}

.calendar-day.today {
    background: var(--color-secondary);
    color: var(--color-text-inverse);
    font-weight: var(--font-bold);
}

.calendar-day.period {
    background: var(--color-primary-subtle);
}

.calendar-day.period.flow-1 { background: var(--flow-1); }
.calendar-day.period.flow-2 { background: var(--flow-2); }
.calendar-day.period.flow-3 { background: var(--flow-3); }
.calendar-day.period.flow-4 { background: var(--flow-4); }
.calendar-day.period.flow-5 { background: var(--flow-5); color: var(--color-text-inverse); }

.calendar-day-number {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

.calendar-day-indicators {
    display: flex;
    gap: 2px;
    margin-top: 2px;
}

.calendar-day-indicator {
    width: 4px;
    height: 4px;
    border-radius: 50%;
}

.indicator-symptom { background: var(--color-warning); }
.indicator-mood { background: var(--color-info); }
.indicator-note { background: var(--color-success); }

/* ==========================================
   Chip / Tag Styles
   ========================================== */
.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid var(--color-border);
}

.chip:hover {
    background: var(--color-primary-subtle);
    border-color: var(--color-primary);
}

.chip.active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

/* ==========================================
   Flow Level Selector
   ========================================== */
.flow-selector {
    display: flex;
    gap: var(--space-sm);
}

.flow-option {
    flex: 1;
    aspect-ratio: 1;
    max-width: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 2px solid transparent;
}

.flow-option.flow-1 { background: var(--flow-1); }
.flow-option.flow-2 { background: var(--flow-2); }
.flow-option.flow-3 { background: var(--flow-3); }
.flow-option.flow-4 { background: var(--flow-4); }
.flow-option.flow-5 { background: var(--flow-5); color: var(--color-text-inverse); }

.flow-option.active {
    border-color: var(--color-text);
    transform: scale(1.1);
}

/* ==========================================
   Page Styles
   ========================================== */
.page {
    animation: fadeIn var(--transition-base);
}

.page-header {
    margin-bottom: var(--space-lg);
}

.page-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

/* ==========================================
   Error Page
   ========================================== */
.error-page {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
}

.error-page h2 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-md);
}

.error-page p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

/* ==========================================
   Utility Classes
   ========================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Privacy Mode Blur */
.privacy-blur {
    filter: blur(8px);
    user-select: none;
    pointer-events: none;
}

/* ==========================================
   Media Queries
   ========================================== */
@media (min-width: 640px) {
    .main-content {
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .modal-content {
        border-radius: var(--radius-xl);
        margin: auto;
        max-height: 80vh;
    }
}

@media (min-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .main-content {
        max-width: 720px;
    }
}

/* Dark mode support (future) */
@media (prefers-color-scheme: dark) {
    /* Dark mode variables would go here */
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================
   Update Banner (PWA)
   ========================================== */
.update-banner {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + var(--space-md));
    left: var(--space-md);
    right: var(--space-md);
    background: var(--color-text);
    color: var(--color-text-inverse);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ==========================================
   Partner Page Styles
   ========================================== */
.partner-page .empty-state {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
}

.empty-state-icon {
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
}

.partner-page h2 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-md);
}

.divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
    color: var(--color-text-muted);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.join-section {
    margin-top: var(--space-lg);
}

.code-input-group {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.code-input {
    text-transform: uppercase;
    text-align: center;
    letter-spacing: 0.1em;
    font-weight: var(--font-semibold);
}

.partner-view {
    padding: var(--space-md);
}

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

.partner-header h2 {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
}

.partner-calendar {
    margin-bottom: var(--space-xl);
}

.partner-status {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.status-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.status-icon {
    font-size: var(--text-xl);
}

.status-text {
    display: flex;
    flex-direction: column;
}

.status-text strong {
    font-weight: var(--font-semibold);
}

.status-card.status-period {
    background: var(--color-primary-subtle);
}

.banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    font-size: var(--text-sm);
}

.banner-info {
    background: var(--color-info-subtle);
    color: var(--color-info);
}

.banner-warning {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

/* Invite Modal */
.invite-modal {
    text-align: center;
}

.code-display {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin: var(--space-md) 0;
}

.code-text {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    letter-spacing: 0.2em;
    font-family: var(--font-mono);
}

.invite-section {
    margin-bottom: var(--space-lg);
}

/* Day Details Modal */
.day-details-modal {
    text-align: center;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
}

.detail-icon {
    font-size: var(--text-xl);
}

/* ==========================================
   Settings Page Styles
   ========================================== */
.settings-page {
    padding: var(--space-lg);
}

.settings-section {
    margin-bottom: var(--space-xl);
}

.settings-section-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    padding-left: var(--space-sm);
}

.settings-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-btn {
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
}

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

.setting-info {
    display: flex;
    flex-direction: column;
}

.setting-label {
    font-weight: var(--font-medium);
}

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

.account-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
}

.account-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
}

.account-details {
    flex: 1;
}

.account-name {
    font-weight: var(--font-semibold);
}

.account-email {
    font-size: var(--text-sm);
}

.anonymous-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
}

.anonymous-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
}

.btn-group {
    display: flex;
    gap: var(--space-sm);
    padding: 0 var(--space-lg) var(--space-lg);
}

/* ==========================================
   Premium Page Styles
   ========================================== */
.premium-page {
    padding: var(--space-lg);
}

.premium-hero {
    text-align: center;
    padding: var(--space-xl) 0;
}

.premium-icon {
    margin-bottom: var(--space-md);
}

.premium-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-xs);
}

.premium-subtitle {
    color: var(--color-text-secondary);
}

.premium-section {
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.features-comparison {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.features-header {
    display: grid;
    grid-template-columns: 1fr 60px 60px;
    padding: var(--space-md);
    background: var(--color-bg);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.feature-row {
    display: grid;
    grid-template-columns: 1fr 60px 60px;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border-light);
    align-items: center;
}

.feature-row:last-child {
    border-bottom: none;
}

.feature-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.feature-icon {
    font-size: var(--text-xl);
}

.feature-details {
    display: flex;
    flex-direction: column;
}

.feature-title {
    font-weight: var(--font-medium);
}

.feature-description {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.feature-free,
.feature-premium {
    text-align: center;
    font-size: var(--text-sm);
}

.feature-premium {
    color: var(--color-primary);
    font-weight: var(--font-semibold);
}

.plans-grid {
    display: grid;
    gap: var(--space-lg);
}

.plan-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.plan-featured {
    border: 2px solid var(--color-primary);
}

.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

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

.plan-name {
    font-size: var(--text-lg);
    margin-bottom: var(--space-sm);
}

.plan-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-xs);
}

.price-amount {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
}

.price-period {
    color: var(--color-text-muted);
}

.plan-savings {
    color: var(--color-success);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    margin-top: var(--space-xs);
}

.plan-features {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-lg);
}

.plan-features li {
    padding: var(--space-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.plan-features li::before {
    content: '✓';
    color: var(--color-success);
    margin-right: var(--space-sm);
}

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

.faq-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    padding: var(--space-md) var(--space-lg);
    font-weight: var(--font-medium);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-size: var(--text-xl);
    color: var(--color-text-muted);
}

.faq-item[open] .faq-question::after {
    content: '−';
}

.faq-answer {
    padding: 0 var(--space-lg) var(--space-lg);
    color: var(--color-text-secondary);
}

/* ==========================================
   Auth Pages (Login/Register)
   ========================================== */
.auth-page {
    min-height: calc(100vh - var(--header-height) - var(--bottom-nav-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

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

.auth-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-sm);
}

.auth-subtitle {
    color: var(--color-text-secondary);
}

.auth-form {
    background: var(--color-surface);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-xl);
}

.auth-link {
    color: var(--color-primary);
    font-weight: var(--font-medium);
}

.auth-benefits {
    margin-top: var(--space-2xl);
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
}

.benefits-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-md);
}

.benefits-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.benefits-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) 0;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-hint {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    cursor: pointer;
}

.checkbox-label input {
    margin-top: 2px;
}

/* ==========================================
   Join Page Styles
   ========================================== */
.join-page {
    min-height: calc(100vh - var(--header-height) - var(--bottom-nav-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.join-confirmation,
.join-success,
.join-error,
.join-processing {
    text-align: center;
    max-width: 400px;
}

.join-icon,
.success-icon,
.error-icon {
    margin-bottom: var(--space-lg);
}

.success-icon {
    animation: scaleIn 0.3s ease-out;
}

@keyframes scaleIn {
    from {
        transform: scale(0);
    }
    to {
        transform: scale(1);
    }
}

.trial-info {
    background: var(--color-bg);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--space-lg);
}

.trial-badge {
    display: inline-block;
    background: var(--color-success);
    color: var(--color-text-inverse);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-sm);
}

/* ==========================================
   About Page Styles
   ========================================== */
.about-page {
    padding: var(--space-lg);
}

.about-header {
    text-align: center;
    padding: var(--space-xl) 0;
}

.about-logo {
    margin-bottom: var(--space-md);
}

.about-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
}

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

.about-section {
    margin-bottom: var(--space-xl);
}

.about-section h2 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.about-section p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.about-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    color: var(--color-text-secondary);
}

.legal-links {
    display: flex;
    gap: var(--space-lg);
}

.legal-link {
    color: var(--color-primary);
}

.about-footer {
    text-align: center;
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border-light);
    margin-top: var(--space-xl);
}

/* ==========================================
   Spinner
   ========================================== */
.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
    margin-right: var(--space-sm);
}

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

/* Privacy Mode */
body.privacy-mode .privacy-sensitive {
    filter: blur(8px);
    user-select: none;
}