/* Perfect Design System - Faculty Feedback System */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

/* CSS Custom Properties - Premium Modern Design */
:root {
    /* Premium Primary Colors - Deep Sapphire */
    --primary-50: #f0f4ff;
    --primary-100: #e0e9ff;
    --primary-200: #c7d6ff;
    --primary-300: #a5b8ff;
    --primary-400: #8b94ff;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #1e1b4b;

    /* Premium Secondary Colors - Elegant Rose Gold */
    --secondary-50: #fef7f0;
    --secondary-100: #fdeee0;
    --secondary-200: #fbd9c0;
    --secondary-300: #f8c195;
    --secondary-400: #f4a261;
    --secondary-500: #e76f51;
    --secondary-600: #d55e3a;
    --secondary-700: #b84a2a;
    --secondary-800: #9a3b22;
    --secondary-900: #7c2d12;

    /* Premium Accent Colors - Luxurious Teal */
    --accent-50: #f0fdfa;
    --accent-100: #ccfbf1;
    --accent-200: #99f6e4;
    --accent-300: #5eead4;
    --accent-400: #2dd4bf;
    --accent-500: #14b8a6;
    --accent-600: #0d9488;
    --accent-700: #0f766e;
    --accent-800: #115e59;
    --accent-900: #134e4a;

    /* Premium Neutral Colors - Sophisticated Grays */
    --gray-50: #fafbfc;
    --gray-100: #f4f6f8;
    --gray-200: #e8ecf0;
    --gray-300: #d1d9e0;
    --gray-400: #a8b5c4;
    --gray-500: #7c8b9a;
    --gray-600: #5a6c7d;
    --gray-700: #3e4c59;
    --gray-800: #2a3441;
    --gray-900: #1a202c;

    /* Premium Text Colors - Enhanced Readability */
    --text-primary: #1a202c;
    --text-secondary: #2d3748;
    --text-muted: #4a5568;
    --text-light: #718096;
    --text-white: #ffffff;
    --text-on-primary: #ffffff;
    --text-on-secondary: #ffffff;
    --text-on-accent: #ffffff;
    --text-luxury: #2a3441;
    --text-premium: #3e4c59;

    /* Premium Semantic Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-200: #bbf7d0;
    --success-300: #86efac;
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    --success-800: #166534;
    --success-900: #14532d;

    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-200: #fde68a;
    --warning-300: #fcd34d;
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;
    --warning-800: #92400e;
    --warning-900: #78350f;

    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-200: #fecaca;
    --error-300: #fca5a5;
    --error-400: #f87171;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --error-700: #b91c1c;
    --error-800: #991b1b;
    --error-900: #7f1d1d;

    /* Premium Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #4f46e5 50%, #4338ca 100%);
    --gradient-secondary: linear-gradient(135deg, #f4a261 0%, #e76f51 50%, #d55e3a 100%);
    --gradient-accent: linear-gradient(135deg, #2dd4bf 0%, #14b8a6 50%, #0d9488 100%);
    --gradient-luxury: linear-gradient(135deg, #1a202c 0%, #2a3441 50%, #3e4c59 100%);
    --gradient-premium: linear-gradient(135deg, #6366f1 0%, #2dd4bf 50%, #f4a261 100%);
    --gradient-hero: linear-gradient(135deg, #1a202c 0%, #4f46e5 25%, #2dd4bf 75%, #f4a261 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.1) 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.9) 100%);

    /* Premium Shadows - Enhanced Depth */
    --shadow-xs: 0 1px 2px 0 rgba(26, 32, 44, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(26, 32, 44, 0.1), 0 1px 2px -1px rgba(26, 32, 44, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(26, 32, 44, 0.1), 0 2px 4px -2px rgba(26, 32, 44, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(26, 32, 44, 0.1), 0 4px 6px -4px rgba(26, 32, 44, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(26, 32, 44, 0.1), 0 8px 10px -6px rgba(26, 32, 44, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(26, 32, 44, 0.25);
    --shadow-premium: 0 32px 64px -12px rgba(26, 32, 44, 0.4);
    --shadow-luxury: 0 40px 80px -16px rgba(99, 102, 241, 0.3);
    --shadow-glow: 0 0 0 1px rgba(255, 255, 255, 0.05), 0 1px 0 0 rgba(255, 255, 255, 0.05);
    --shadow-colored: 0 10px 25px -5px rgba(99, 102, 241, 0.25), 0 8px 10px -6px rgba(99, 102, 241, 0.1);
    --shadow-glass: 0 8px 32px rgba(26, 32, 44, 0.12), 0 4px 16px rgba(26, 32, 44, 0.08);

    /* Premium Border Radius */
    --radius-xs: 0.125rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-4xl: 2.5rem;
    --radius-full: 9999px;

    /* Spacing */
    --space-px: 1px;
    --space-0: 0;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Premium Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-display: 'Inter', 'Cal Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

    --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: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    --font-size-7xl: 4.5rem;
    --font-size-8xl: 6rem;
    --font-size-9xl: 8rem;

    --font-weight-thin: 100;
    --font-weight-extralight: 200;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    --font-weight-black: 900;

    --line-height-none: 1;
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Premium Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-premium: 400ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-luxury: 600ms cubic-bezier(0.23, 1, 0.32, 1);

    /* Premium Animation Curves */
    --ease-linear: linear;
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --ease-premium: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-luxury: cubic-bezier(0.23, 1, 0.32, 1);

    /* Premium Backdrop Filters */
    --backdrop-blur-sm: blur(4px);
    --backdrop-blur-md: blur(8px);
    --backdrop-blur-lg: blur(16px);
    --backdrop-blur-xl: blur(24px);
    --backdrop-blur-2xl: blur(40px);
    --backdrop-blur-3xl: blur(64px);
}

/* Base Styles - Premium Foundation */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-luxury);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'kern'1, 'liga'1, 'calt'1;
    letter-spacing: -0.01em;
}

/* Premium Selection Styles */
::selection {
    background: linear-gradient(135deg, var(--primary-200) 0%, var(--accent-200) 100%);
    color: var(--primary-900);
    text-shadow: none;
}

::-moz-selection {
    background: linear-gradient(135deg, var(--primary-200) 0%, var(--accent-200) 100%);
    color: var(--primary-900);
    text-shadow: none;
}

/* Premium Focus Styles */
:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

:focus:not(:focus-visible) {
    outline: none;
    box-shadow: none;
}

:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

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

.not-sr-only {
    position: static;
    width: auto;
    height: auto;
    padding: 0;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }
}

/* Premium Typography Components */
.heading-1 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-6xl);
    font-weight: var(--font-weight-black);
    line-height: var(--line-height-tight);
    letter-spacing: -0.04em;
    color: var(--text-luxury);
    background: var(--gradient-premium);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 20px rgba(26, 32, 44, 0.1);
}

.heading-2 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.03em;
    color: var(--text-luxury);
    background: var(--gradient-luxury);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.heading-3 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-snug);
    letter-spacing: -0.02em;
    color: var(--text-luxury);
}

.heading-4 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: -0.01em;
    color: var(--text-luxury);
}

.text-large {
    font-size: var(--font-size-xl);
    line-height: var(--line-height-relaxed);
    color: var(--text-premium);
    font-weight: var(--font-weight-medium);
}

.text-base {
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-muted);
    font-weight: var(--font-weight-normal);
}

.text-small {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
    color: var(--text-light);
    font-weight: var(--font-weight-medium);
}

/* Premium Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border-radius: var(--radius-2xl);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-premium);
    text-decoration: none;
    white-space: nowrap;
    /* user-select: none; */
    /* REMOVED: Allow text selection */
    position: relative;
    overflow: hidden;
    backdrop-filter: var(--backdrop-blur-sm);
    font-feature-settings: 'kern'1;
    letter-spacing: -0.01em;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-luxury);
}

.btn:hover::before {
    left: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-luxury);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    box-shadow: var(--shadow-premium);
    transform: translateY(-3px) scale(1.02);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.01);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--gradient-card);
    color: var(--text-luxury);
    border: 1px solid rgba(26, 32, 44, 0.1);
    box-shadow: var(--shadow-glass);
    backdrop-filter: var(--backdrop-blur-md);
}

.btn-secondary:hover {
    background: var(--gradient-glass);
    border-color: var(--primary-300);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.btn-ghost {
    background: transparent;
    color: var(--text-premium);
    border: 1px solid rgba(26, 32, 44, 0.1);
    backdrop-filter: var(--backdrop-blur-sm);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--primary-600);
    border-color: var(--primary-300);
    backdrop-filter: var(--backdrop-blur-md);
}

.btn-large {
    padding: var(--space-5) var(--space-10);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-3xl);
}

.btn-small {
    padding: var(--space-2) var(--space-6);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-xl);
}

/* Premium Form Components */
.form-group {
    margin-bottom: var(--space-8);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-luxury);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.form-input {
    display: block;
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-luxury);
    background: var(--gradient-card);
    border: 1px solid rgba(26, 32, 44, 0.1);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-glass);
    transition: all var(--transition-premium);
    backdrop-filter: var(--backdrop-blur-md);
    font-weight: var(--font-weight-medium);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1), var(--shadow-xl);
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.98);
}

.form-input::placeholder {
    color: var(--text-light);
    font-weight: var(--font-weight-normal);
}

.form-select {
    display: block;
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-luxury);
    background: var(--gradient-card);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%233e4c59' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-4) center;
    background-repeat: no-repeat;
    background-size: 16px 12px;
    border: 1px solid rgba(26, 32, 44, 0.1);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-glass);
    transition: all var(--transition-premium);
    appearance: none;
    padding-right: var(--space-12);
    backdrop-filter: var(--backdrop-blur-md);
    font-weight: var(--font-weight-medium);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1), var(--shadow-xl);
    transform: translateY(-2px);
}

/* Premium Card Components */
.card {
    background: var(--gradient-card);
    border-radius: var(--radius-3xl);
    box-shadow: var(--shadow-glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
    transition: all var(--transition-luxury);
    backdrop-filter: var(--backdrop-blur-lg);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
}

.card:hover {
    box-shadow: var(--shadow-premium);
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(99, 102, 241, 0.2);
}

.card-header {
    padding: var(--space-8);
    border-bottom: 1px solid rgba(26, 32, 44, 0.1);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
}

.card-body {
    padding: var(--space-8);
}

.card-footer {
    padding: var(--space-8);
    border-top: 1px solid rgba(26, 32, 44, 0.1);
    background: linear-gradient(135deg, rgba(26, 32, 44, 0.02) 0%, rgba(26, 32, 44, 0.05) 100%);
}

/* Alert Components */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: none;
}

.alert.show {
    display: block;
    animation: slideDown 0.3s var(--ease-out);
}

.alert-success {
    background: var(--success-50);
    color: var(--success-600);
    border-color: var(--success-200);
}

.alert-warning {
    background: var(--warning-50);
    color: var(--warning-600);
    border-color: var(--warning-200);
}

.alert-error {
    background: var(--error-50);
    color: var(--error-600);
    border-color: var(--error-200);
}

/* Animation Keyframes */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* Responsive Utilities */
@media (max-width: 639px) {
    .sm\:hidden {
        display: none;
    }

    .heading-1 {
        font-size: var(--font-size-4xl);
    }

    .heading-2 {
        font-size: var(--font-size-3xl);
    }
}

@media (min-width: 640px) {
    .sm\:block {
        display: block;
    }

    .sm\:flex {
        display: flex;
    }

    .sm\:grid {
        display: grid;
    }
}

@media (min-width: 768px) {
    .md\:block {
        display: block;
    }

    .md\:flex {
        display: flex;
    }

    .md\:grid {
        display: grid;
    }
}

@media (min-width: 1024px) {
    .lg\:block {
        display: block;
    }

    .lg\:flex {
        display: flex;
    }

    .lg\:grid {
        display: grid;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --gray-50: #0f172a;
        --gray-100: #1e293b;
        --gray-200: #334155;
        --gray-300: #475569;
        --gray-400: #64748b;
        --gray-500: #94a3b8;
        --gray-600: #cbd5e1;
        --gray-700: #e2e8f0;
        --gray-800: #f1f5f9;
        --gray-900: #f8fafc;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }

    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    .btn {
        border: 1px solid black;
        background: white;
        color: black;
    }
}