/* ========================================================================
   PREMIUM 2025 DESIGN SYSTEM
   Modern Beauty Booking Interface
   ======================================================================== */

/* ========================================================================
   1. DESIGN TOKENS & VARIABLES
   ======================================================================== */

:root {
    /* === 8px Grid System === */
    --spacing-1: 8px;
    --spacing-2: 16px;
    --spacing-3: 24px;
    --spacing-4: 32px;
    --spacing-5: 40px;
    --spacing-6: 48px;
    --spacing-7: 56px;
    --spacing-8: 64px;
    --spacing-9: 72px;
    --spacing-10: 80px;

    /* === Modern Color Palette === */
    /* Primary - Soft Teal/Blue */
    --color-primary-50: #f0f9ff;
    --color-primary-100: #e0f2fe;
    --color-primary-200: #bae6fd;
    --color-primary-300: #7dd3fc;
    --color-primary-400: #38bdf8;
    --color-primary-500: #0ea5e9;
    --color-primary-600: #0284c7;
    --color-primary-700: #0369a1;
    --color-primary-800: #075985;
    --color-primary-900: #0c4a6e;

    /* Secondary - Soft Purple */
    --color-secondary-50: #faf5ff;
    --color-secondary-100: #f3e8ff;
    --color-secondary-200: #e9d5ff;
    --color-secondary-300: #d8b4fe;
    --color-secondary-400: #c084fc;
    --color-secondary-500: #a855f7;
    --color-secondary-600: #9333ea;
    --color-secondary-700: #7e22ce;
    --color-secondary-800: #6b21a8;
    --color-secondary-900: #581c87;

    /* Accent - Warm Coral */
    --color-accent-50: #fff7ed;
    --color-accent-100: #ffedd5;
    --color-accent-200: #fed7aa;
    --color-accent-300: #fdba74;
    --color-accent-400: #fb923c;
    --color-accent-500: #f97316;
    --color-accent-600: #ea580c;
    --color-accent-700: #c2410c;
    --color-accent-800: #9a3412;
    --color-accent-900: #7c2d12;

    /* Neutrals */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* === Typography === */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;

    /* Font Sizes */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */

    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* === Shadows === */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

    /* === Border Radius === */
    --radius-sm: 4px;
    --radius-base: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* === Transitions === */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* === Z-Index Scale === */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ========================================================================
   2. GLOBAL RESETS & BASE STYLES
   ======================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================================================
   3. TYPOGRAPHY SYSTEM
   ======================================================================== */

.heading-1 {
    font-family: var(--font-display);
    font-size: var(--text-5xl);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.02em;
}

.heading-2 {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.01em;
}

.heading-3 {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: var(--font-semibold);
    line-height: var(--leading-snug);
}

.heading-4 {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    line-height: var(--leading-snug);
}

.heading-5 {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    line-height: var(--leading-normal);
}

.heading-6 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    line-height: var(--leading-normal);
}

.body-large {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
}

.body-base {
    font-size: var(--text-base);
    line-height: var(--leading-normal);
}

.body-small {
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
}

.caption {
    font-size: var(--text-xs);
    line-height: var(--leading-normal);
    color: var(--color-gray-600);
}

/* ========================================================================
   4. BUTTON SYSTEM
   ======================================================================== */

.btn-premium {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-3);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: 1;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-premium:hover::before {
    opacity: 1;
}

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-base);
}

/* Secondary Button */
.btn-secondary {
    background: white;
    color: var(--color-primary-700);
    border: 2px solid var(--color-primary-200);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--color-primary-50);
    border-color: var(--color-primary-300);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Accent Button */
.btn-accent {
    background: linear-gradient(135deg, var(--color-accent-500) 0%, var(--color-accent-600) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-accent:hover {
    background: linear-gradient(135deg, var(--color-accent-600) 0%, var(--color-accent-700) 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

/* Button Sizes */
.btn-sm {
    padding: calc(var(--spacing-1) * 1.5) var(--spacing-2);
    font-size: var(--text-sm);
}

.btn-lg {
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--text-lg);
}

.btn-xl {
    padding: var(--spacing-4) var(--spacing-5);
    font-size: var(--text-xl);
}

/* ========================================================================
   5. CARD SYSTEM
   ======================================================================== */

.card-premium {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-base);
    transition: all var(--transition-base);
    overflow: hidden;
}

.card-premium:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-premium-header {
    padding: var(--spacing-3);
    border-bottom: 1px solid var(--color-gray-100);
}

.card-premium-body {
    padding: var(--spacing-3);
}

.card-premium-footer {
    padding: var(--spacing-3);
    border-top: 1px solid var(--color-gray-100);
    background-color: var(--color-gray-50);
}

/* ========================================================================
   6. BADGE SYSTEM
   ======================================================================== */

.badge-premium {
    display: inline-flex;
    align-items: center;
    gap: calc(var(--spacing-1) / 2);
    padding: calc(var(--spacing-1) / 2) var(--spacing-2);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-primary {
    background-color: var(--color-primary-100);
    color: var(--color-primary-700);
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-error {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-popular {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: white;
    font-weight: var(--font-semibold);
}

.badge-recommended {
    background: linear-gradient(135deg, var(--color-secondary-500) 0%, var(--color-secondary-600) 100%);
    color: white;
    font-weight: var(--font-semibold);
}

/* ========================================================================
   7. INPUT SYSTEM
   ======================================================================== */

.input-premium {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    color: var(--color-gray-900);
    background-color: white;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    outline: none;
}

.input-premium:focus {
    border-color: var(--color-primary-400);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.input-premium::placeholder {
    color: var(--color-gray-400);
}

/* ========================================================================
   8. ANIMATION UTILITIES
   ======================================================================== */

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.animate-fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

.animate-slide-in-right {
    animation: slideInRight var(--transition-base) ease-out;
}

.animate-scale-in {
    animation: scaleIn var(--transition-base) ease-out;
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ========================================================================
   9. UTILITY CLASSES
   ======================================================================== */

/* Spacing */
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-5 { padding: var(--spacing-5); }

.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-3 { margin: var(--spacing-3); }
.m-4 { margin: var(--spacing-4); }
.m-5 { margin: var(--spacing-5); }

/* Flexbox */
.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-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }

/* Grid */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Colors */
.text-primary { color: var(--color-primary-600); }
.text-secondary { color: var(--color-secondary-600); }
.text-accent { color: var(--color-accent-600); }
.text-muted { color: var(--color-gray-500); }

.bg-primary { background-color: var(--color-primary-500); }
.bg-secondary { background-color: var(--color-secondary-500); }
.bg-white { background-color: white; }
.bg-gray-50 { background-color: var(--color-gray-50); }

/* Rounded Corners */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-base); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Transitions */
.transition { transition: all var(--transition-base); }
.transition-fast { transition: all var(--transition-fast); }
.transition-slow { transition: all var(--transition-slow); }