/* ============================================
   PROFESSOR DANJUMA SALE - DESIGN SYSTEM
   World-Class Neurosurgeon Portfolio
   ============================================ */

/* ===== Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&display=swap');


/* ===== CSS Custom Properties ===== */
:root {
    /* Primary Colors - Authority & Trust */
    --primary-deep: #0a0f1a;
    --primary-navy: #101827;
    --primary-medical: #1E3A5F;
    --primary-light: #2A4A70;

    /* Accent Colors - Excellence & Innovation */
    --accent-gold: #C9A227;
    --accent-gold-light: #DDB94A;
    --accent-gold-dark: #A68B1F;
    --accent-teal: #2DD4BF;
    --accent-teal-dark: #14B8A6;
    --accent-blue: #3B82F6;

    /* Neutral Colors */
    --neutral-50: #F8FAFC;
    --neutral-100: #F1F5F9;
    --neutral-200: #E2E8F0;
    --neutral-300: #CBD5E1;
    --neutral-400: #94A3B8;
    --neutral-500: #64748B;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1E293B;
    --neutral-900: #0F172A;

    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #8a9bb8;
    --text-muted: #64748B;
    --text-accent: var(--accent-gold);
    --text-dark: #0F172A;

    /* Surface Colors */
    --surface-primary: var(--primary-deep);
    --surface-secondary: var(--primary-navy);
    --surface-card: rgba(255, 255, 255, 0.03);
    --surface-card-hover: rgba(255, 255, 255, 0.06);
    --surface-glass: rgba(255, 255, 255, 0.05);
    --surface-glass-border: rgba(255, 255, 255, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-deep) 0%, var(--primary-navy) 50%, var(--primary-medical) 100%);
    --gradient-gold: linear-gradient(135deg, var(--accent-gold-dark) 0%, var(--accent-gold) 50%, var(--accent-gold-light) 100%);
    --gradient-hero: linear-gradient(180deg, rgba(10, 15, 26, 0) 0%, rgba(10, 15, 26, 0.7) 50%, rgba(10, 15, 26, 0.95) 100%);
    --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
    --gradient-radial: radial-gradient(ellipse at center, var(--primary-navy) 0%, var(--primary-deep) 70%);
    --gradient-text: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-gold) 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    /* Font Sizes - Fluid Typography (4xl → 5xl → 6xl → 7xl responsive) */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
    --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.25rem);
    --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
    --text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
    --text-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.5rem);
    --text-5xl: clamp(3rem, 2rem + 5vw, 5rem);
    --text-6xl: clamp(3.5rem, 2.5rem + 6vw, 6rem);
    --text-7xl: clamp(4rem, 3rem + 7vw, 7rem);

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

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.15;
    --leading-snug: 1.3;
    --leading-normal: 1.5;
    --leading-relaxed: 1.7;

    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;

    /* Spacing */
    --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;
    --space-40: 10rem;

    /* Container */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --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-glow: 0 0 40px rgba(201, 169, 97, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-slower: 700ms ease;
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-smooth: 600ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index */
    --z-base: 0;
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-fixed: 30;
    --z-modal-backdrop: 40;
    --z-modal: 50;
    --z-popover: 60;
    --z-tooltip: 70;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background: var(--surface-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Remove default list styles */
ul,
ol {
    list-style: none;
}

/* Remove default anchor styles */
a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

/* Remove default button styles */
button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

/* Images */
img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Form elements */
input,
button,
textarea,
select {
    font: inherit;
    color: inherit;
}

/* Remove animations for reduced motion preference */
@media (prefers-reduced-motion: reduce) {

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

/* ===== Typography Utilities ===== */
.font-display {
    font-family: var(--font-display);
}

.text-gradient {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-balance {
    text-wrap: balance;
}

/* Headings */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
}

h1 {
    font-size: var(--text-5xl);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-3xl);
}

h4 {
    font-size: var(--text-2xl);
}

h5 {
    font-size: var(--text-xl);
}

h6 {
    font-size: var(--text-lg);
}

/* Paragraphs */
p {
    line-height: var(--leading-relaxed);
}

.lead {
    font-size: var(--text-xl);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

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

/* ===== Layout Utilities ===== */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin-inline: auto;
    padding-inline: var(--space-6);
}

@media (min-width: 768px) {
    .container {
        padding-inline: var(--space-8);
    }
}

@media (min-width: 1280px) {
    .container {
        padding-inline: var(--space-12);
    }
}

.section {
    padding-block: var(--space-24);
}

@media (min-width: 768px) {
    .section {
        padding-block: var(--space-32);
    }
}

/* Flexbox utilities */
.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-2 {
    gap: var(--space-2);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* Grid utilities */
.grid {
    display: grid;
}

/* ===== Glassmorphism Utilities ===== */
.glass {
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--surface-glass-border);
}

.glass-dark {
    background: rgba(10, 22, 40, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===== Visual Effects ===== */
.glow-gold {
    box-shadow: var(--shadow-glow);
}

.border-gradient {
    position: relative;
    background: var(--surface-card);
    border-radius: var(--radius-xl);
}

.border-gradient::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, var(--accent-gold) 0%, transparent 50%, var(--accent-teal) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* ===== Selection ===== */
::selection {
    background: var(--accent-gold);
    color: var(--primary-deep);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-deep);
}

::-webkit-scrollbar-thumb {
    background: var(--neutral-600);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neutral-500);
}

/* ===== Focus Styles ===== */
:focus-visible {
    outline: 2px solid var(--accent-gold);
    outline-offset: 2px;
}

/* ===== Screen Reader Only ===== */
.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;
}