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

/* Light Mode Variables */
:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F2F2F7;
    --bg-tertiary: #E5E5EA;
    --bg-grouped: #F2F2F7;
    --text-primary: #000000;
    --text-secondary: rgba(60, 60, 67, 0.6);
    --text-tertiary: rgba(60, 60, 67, 0.3);
    --accent: #007AFF;
    --accent-hover: #0056CC;
    --destructive: #FF3B30;
    --success: #34C759;
    --warning: #FF9500;
    --separator: rgba(60, 60, 67, 0.12);
    --card-bg: #FFFFFF;
    --nav-bg: rgba(249, 249, 249, 0.94);
    --tab-bg: rgba(249, 249, 249, 0.94);
    --input-bg: rgba(118, 118, 128, 0.12);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

    /* Tag Colors */
    --tag-blue: #007AFF;
    --tag-blue-bg: rgba(0, 122, 255, 0.12);
    --tag-green: #34C759;
    --tag-green-bg: rgba(52, 199, 89, 0.12);
    --tag-orange: #FF9500;
    --tag-orange-bg: rgba(255, 149, 0, 0.12);
    --tag-red: #FF3B30;
    --tag-red-bg: rgba(255, 59, 48, 0.12);
    --tag-purple: #AF52DE;
    --tag-purple-bg: rgba(175, 82, 222, 0.12);
    --tag-teal: #5AC8FA;
    --tag-teal-bg: rgba(90, 200, 250, 0.12);
    --tag-pink: #FF2D55;
    --tag-pink-bg: rgba(255, 45, 85, 0.12);
    --tag-indigo: #5856D6;
    --tag-indigo-bg: rgba(88, 86, 214, 0.12);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 15px;
    --font-size-md: 17px;
    --font-size-lg: 20px;
    --font-size-xl: 28px;
    --font-size-xxl: 34px;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-tight: 1.2;
    --line-height-normal: 1.47;
    --line-height-relaxed: 1.6;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-base: 16px;
    --space-lg: 20px;
    --space-xl: 24px;
    --space-xxl: 32px;
    --space-xxxl: 44px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1C1C1E;
        --bg-tertiary: #2C2C2E;
        --bg-grouped: #000000;
        --text-primary: #FFFFFF;
        --text-secondary: rgba(235, 235, 245, 0.6);
        --text-tertiary: rgba(235, 235, 245, 0.3);
        --accent: #0A84FF;
        --accent-hover: #409CFF;
        --destructive: #FF453A;
        --success: #30D158;
        --warning: #FF9F0A;
        --separator: rgba(84, 84, 88, 0.36);
        --card-bg: #1C1C1E;
        --nav-bg: rgba(29, 29, 31, 0.94);
        --tab-bg: rgba(29, 29, 31, 0.94);
        --input-bg: rgba(118, 118, 128, 0.24);

        /* Tag Colors Dark */
        --tag-blue-bg: rgba(0, 122, 255, 0.2);
        --tag-green-bg: rgba(52, 199, 89, 0.2);
        --tag-orange-bg: rgba(255, 149, 0, 0.2);
        --tag-red-bg: rgba(255, 59, 48, 0.2);
        --tag-purple-bg: rgba(175, 82, 222, 0.2);
        --tag-teal-bg: rgba(90, 200, 250, 0.2);
        --tag-pink-bg: rgba(255, 45, 85, 0.2);
        --tag-indigo-bg: rgba(88, 86, 214, 0.2);
    }
}

/* Base Styles */
html, body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    overscroll-behavior: none;
    height: 100%;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

@media (min-width: 500px) {
    body {
        display: flex;
        justify-content: center;
        background-color: var(--bg-tertiary);
    }
    #app {
        width: 100%;
        max-width: 500px;
        background-color: var(--bg-secondary);
        position: relative;
        box-shadow: var(--shadow-lg);
    }
}

.rtl {
    direction: rtl;
}

.hidden {
    display: none !important;
}

/* Animations */
@keyframes fadeIn { 
    from { opacity: 0; } 
    to { opacity: 1; } 
}
@keyframes slideUp { 
    from { transform: translateY(20px); opacity: 0; } 
    to { transform: translateY(0); opacity: 1; } 
}
@keyframes slideInRight { 
    from { transform: translateX(100%); } 
    to { transform: translateX(0); } 
}
@keyframes slideInLeft { 
    from { transform: translateX(-100%); } 
    to { transform: translateX(0); } 
}
@keyframes scaleIn { 
    from { transform: scale(0.95); opacity: 0; } 
    to { transform: scale(1); opacity: 1; } 
}
@keyframes spin { 
    to { transform: rotate(360deg); } 
}

.fade-in { animation: fadeIn 0.3s ease; }
.slide-up { animation: slideUp 0.35s ease; }