/* ========================================
   ADHD-Friendly Reminders - Main Styles
   Mobile-First Responsive Design
   ======================================== */

/* ===== CSS Reset ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== Root Variables ===== */
:root {
    /* Colors - Priority System */
    --color-someday: #2196F3;         /* Blue */
    --color-someday-light: #E3F2FD;
    --color-chill: #4CAF50;        /* Green - Low priority */
    --color-chill-light: #E8F5E9;
    --color-important: #FFC107;    /* Yellow - Medium priority */
    --color-important-light: #FFF9C4;
    --color-urgent: #F44336;       /* Red - High priority */
    --color-urgent-light: #FFEBEE;
    --color-waiting: #FF9800;         /* Orange */
    --color-waiting-light: #FFF3E0;

    /* Base Colors */
    --color-primary: #2196F3;
    --color-primary-dark: #1976D2;
    --color-secondary: #757575;
    --color-success: #4CAF50;
    --color-danger: #F44336;
    --color-warning: #FFC107;

    /* Text Colors */
    --color-text-primary: #212121;
    --color-text-secondary: #757575;
    --color-text-disabled: #BDBDBD;
    --color-text-white: #FFFFFF;

    /* Background Colors */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F5F5F5;
    --color-bg-tertiary: #EEEEEE;

    /* Border Colors */
    --color-border: #E0E0E0;
    --color-border-focus: #2196F3;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.2);

    /* Spacing Scale (8px base) */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-xxl: 24px;
    --font-size-xxxl: 32px;

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* ===== Base Styles ===== */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    min-height: 100vh;
}

/* ===== Layout Container ===== */
.app-container {
    max-width: 100%;
    min-height: 100vh;
    background-color: var(--color-bg-secondary);
    display: flex;
    flex-direction: column;
}

/* Desktop: Center and constrain width */
@media (min-width: 768px) {
    .app-container {
        max-width: 768px;
        margin: 0 auto;
        box-shadow: var(--shadow-md);
    }
}

/* ===== Header ===== */
.app-header {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.page-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    flex: 1;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== Navigation ===== */
.app-nav {
    background-color: var(--color-bg-primary);
    display: flex;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 57px; /* Height of header */
    z-index: 99;
}

.nav-link {
    flex: 1;
    padding: var(--spacing-md);
    text-align: center;
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-secondary);
}

.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    padding: var(--spacing-md);
    padding-bottom: 80px; /* Space for FAB */
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-height: 44px; /* Touch target */
}

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

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

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

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

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* ===== Floating Action Button ===== */
.fab {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 56px;
    height: 56px;
    background-color: var(--color-primary);
    color: var(--color-text-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: var(--font-size-xxxl);
    font-weight: 300;
    transition: all var(--transition-fast);
    z-index: 1000;
}

.fab:hover {
    background-color: var(--color-primary-dark);
    transform: scale(1.1);
}

.fab-icon {
    line-height: 1;
}

/* Desktop: Position relative to container */
@media (min-width: 768px) {
    .fab {
        position: absolute;
        right: var(--spacing-lg);
        bottom: var(--spacing-lg);
    }
}

/* ===== Priority Badges ===== */
.priority-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 4px 12px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.priority-badge.chill {
    background-color: var(--color-chill-light);
    color: var(--color-chill);
}

.priority-badge.important {
    background-color: var(--color-important-light);
    color: #F57C00; /* Darker yellow for readability */
}

.priority-badge.urgent {
    background-color: var(--color-urgent-light);
    color: var(--color-urgent);
}

.priority-badge.someday {
    background-color: var(--color-someday-light);
    color: var(--color-someday);
}

.priority-badge.waiting {
    background-color: var(--color-waiting-light);
    color: #E65100; /* Darker orange for readability */
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
    color: var(--color-text-secondary);
}

.empty-state p {
    margin-bottom: var(--spacing-sm);
}

.empty-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-disabled);
}

/* ===== Loading Spinner ===== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

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

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

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

/* Mobile: Center toasts */
@media (max-width: 767px) {
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        align-items: center;
    }
}

.toast {
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 280px;
    max-width: 400px;
    width: 100%;
    pointer-events: all;
    opacity: 0;
    transform: translateX(120%);
    transition: all 0.3s ease-out;
}

/* Mobile: Smaller max-width */
@media (max-width: 767px) {
    .toast {
        max-width: 100%;
        min-width: 0;
        transform: translateY(-120%);
    }
}

.toast-visible {
    opacity: 1;
    transform: translateX(0);
}

@media (max-width: 767px) {
    .toast-visible {
        transform: translateY(0);
    }
}

.toast-hiding {
    opacity: 0;
    transform: translateX(120%);
}

@media (max-width: 767px) {
    .toast-hiding {
        transform: translateY(-120%);
    }
}

.toast-icon {
    font-size: 20px;
    font-weight: bold;
    line-height: 1;
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    word-wrap: break-word;
}

.toast-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    font-size: 24px;
    line-height: 1;
    color: var(--color-text-secondary);
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toast-close:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

/* Toast type variants */
.toast-success {
    border-left: 4px solid var(--color-chill);
}

.toast-success .toast-icon {
    color: var(--color-chill);
}

.toast-error {
    border-left: 4px solid var(--color-urgent);
}

.toast-error .toast-icon {
    color: var(--color-urgent);
}

.toast-warning {
    border-left: 4px solid var(--color-important);
}

.toast-warning .toast-icon {
    color: #F57C00; /* Darker yellow for readability */
}

.toast-info {
    border-left: 4px solid var(--color-primary);
}

.toast-info .toast-icon {
    color: var(--color-primary);
}

/* ===== Accessibility ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles for keyboard navigation */
*:focus {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
}

button:focus,
a:focus {
    outline: 2px solid var(--color-border-focus);
}

/* ===== Sync Status UI (Phase 5) ===== */
.sync-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.sync-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    transition: background-color var(--transition-fast);
}

/* Sync status colors */
.sync-indicator.sync-offline {
    background-color: var(--color-text-disabled);
}

.sync-indicator.sync-online {
    background-color: var(--color-success);
}

.sync-indicator.sync-syncing {
    background-color: var(--color-primary);
    animation: sync-pulse 1.5s ease-in-out infinite;
}

.sync-indicator.sync-synced {
    background-color: var(--color-success);
}

.sync-indicator.sync-error {
    background-color: var(--color-danger);
}

/* Sync pulse animation */
@keyframes sync-pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.3);
    }
}

.sync-text {
    white-space: nowrap;
    font-weight: 500;
}

/* Sync button states */
#syncBtn {
    transition: all var(--transition-fast);
}

#syncBtn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#syncBtn:not(:disabled):hover {
    background-color: var(--color-bg-tertiary);
    transform: rotate(180deg);
}

#syncBtn:not(:disabled):active {
    transform: rotate(180deg) scale(0.95);
}

/* Mobile responsive sync status */
@media (max-width: 480px) {
    .sync-text {
        display: none;
    }

    .sync-status {
        padding: var(--spacing-xs);
        min-width: 24px;
        justify-content: center;
    }

    .sync-indicator {
        margin: 0;
    }
}