/* ========================================
   MODERN GLOBAL STYLES
   Professional Portfolio - 2025 Edition
   ======================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&family=Roboto:wght@400;500;700&display=swap');

/* ========================================
   CSS VARIABLES - MODERN DESIGN SYSTEM
   ======================================== */

:root {
    /* ===== COLOR PALETTE ===== */
    /* Primary Colors */
    --color-primary: #2c3e50;
    --color-primary-light: #34495e;
    --color-primary-dark: #1a252f;

    /* Secondary Colors */
    --color-secondary: #3498db;
    --color-secondary-light: #5dade2;
    --color-secondary-dark: #2980b9;

    /* Accent Colors */
    --color-accent: #e74c3c;
    --color-accent-light: #ec7063;
    --color-accent-dark: #c0392b;

    /* Semantic Colors */
    --color-success: #27ae60;
    --color-warning: #f39c12;

    /* Neutral Scale */
    --color-neutral-50: #fafafa;
    --color-neutral-100: #f5f5f5;
    --color-neutral-200: #e5e5e5;
    --color-neutral-300: #d4d4d4;
    --color-neutral-400: #a3a3a3;
    --color-neutral-500: #737373;
    --color-neutral-600: #525252;
    --color-neutral-700: #404040;
    --color-neutral-800: #262626;
    --color-neutral-900: #171717;

    /* Background & Text */
    --color-background: #f5f5f5;
    --color-surface: #ffffff;
    --color-text: #333333;
    --color-text-light: #777777;
    --color-text-lighter: #999999;

    /* ===== TYPOGRAPHY ===== */
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Roboto', sans-serif;

    /* Font Sizes - Fluid Typography */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* ===== SPACING SYSTEM (8px base) ===== */
    --spacing-xs: 0.5rem;      /* 8px */
    --spacing-sm: 1rem;        /* 16px */
    --spacing-md: 1.5rem;      /* 24px */
    --spacing-lg: 2rem;        /* 32px */
    --spacing-xl: 3rem;        /* 48px */
    --spacing-2xl: 4rem;       /* 64px */
    --spacing-3xl: 6rem;       /* 96px */

    /* ===== ELEVATION SYSTEM - LAYERED SHADOWS ===== */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15), 0 4px 10px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2), 0 8px 16px rgba(0, 0, 0, 0.12);

    /* Colored Shadows */
    --shadow-primary: 0 4px 14px rgba(44, 62, 80, 0.2);
    --shadow-secondary: 0 4px 14px rgba(52, 152, 219, 0.3);
    --shadow-accent: 0 4px 14px rgba(231, 76, 60, 0.3);

    /* ===== BORDER RADIUS ===== */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* ===== TRANSITIONS ===== */
    --transition-fast: 0.15s;
    --transition-base: 0.3s;
    --transition-slow: 0.5s;

    /* Easing Functions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

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

    /* ===== 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;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

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

body {
    font-family: var(--font-secondary);
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

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

a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition-base) var(--ease-in-out);
}

a:hover {
    color: var(--color-secondary-dark);
}

a:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ========================================
   CONTAINER
   ======================================== */

.container {
    width: 90%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-sm {
    max-width: var(--container-sm);
}

.container-md {
    max-width: var(--container-md);
}

.container-lg {
    max-width: var(--container-lg);
}

.container-2xl {
    max-width: var(--container-2xl);
}

/* ========================================
   NAVIGATION - MODERN GLASSMORPHISM
   ======================================== */

nav {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    transition: all var(--transition-base) var(--ease-in-out);
    box-shadow: var(--shadow-md);
}

nav.scrolled {
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-md);
}

nav .logo a {
    font-family: var(--font-primary);
    font-size: clamp(1.5rem, 2.5vw, 1.8rem);
    color: white;
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    transition: all var(--transition-base) var(--ease-in-out);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

nav .logo a:hover {
    color: var(--color-secondary-light);
    transform: translateY(-2px);
}

nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: max-height var(--transition-base) ease-in-out;
}

nav ul li {
    position: relative;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base) var(--ease-in-out);
    display: block;
    position: relative;
}

nav ul li.nav-cta {
    margin-left: var(--spacing-sm);
}

nav ul li.nav-cta .nav-resume-btn {
    background: white;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-xs) + 0.125rem) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 0.02em;
}

nav ul li.nav-cta .nav-resume-btn:hover {
    background: var(--color-secondary);
    color: white;
    box-shadow: var(--shadow-lg);
}

nav ul li.nav-cta .nav-resume-btn:focus-visible {
    outline: 2px solid white;
    outline-offset: 4px;
}

nav ul li.nav-cta .nav-resume-btn.active {
    background: var(--color-secondary);
    color: white;
}

nav ul li.nav-cta .nav-resume-btn::after {
    display: none;
}

nav ul li a:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Active page indicator */
nav ul li a.active {
    background: rgba(52, 152, 219, 0.2);
    color: var(--color-secondary-light);
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    height: 2px;
    background: var(--color-secondary-light);
    border-radius: 2px;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: white;
    padding: var(--spacing-xs);
    border: none;
    background: transparent;
    transition: transform var(--transition-base) var(--ease-in-out);
}

.menu-toggle:hover {
    transform: scale(1.1);
}

.menu-toggle:focus-visible {
    outline: 2px solid var(--color-secondary-light);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* ========================================
   FOOTER - MULTI-COLUMN MODERN LAYOUT
   ======================================== */

footer {
    background: var(--color-primary-light);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    position: relative;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.05);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: white;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-xs);
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all var(--transition-base) var(--ease-in-out);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-links a:hover {
    color: var(--color-secondary-light);
    transform: translateX(4px);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.social-links a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-xl);
    transition: all var(--transition-base) var(--ease-in-out);
}

.social-links a:hover {
    background: var(--color-secondary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-bottom a:hover {
    color: var(--color-secondary-light);
}

/* ========================================
   SECTIONS
   ======================================== */

section {
    padding: var(--spacing-3xl) 0;
}

section.compact {
    padding: var(--spacing-xl) 0;
}

/* ========================================
   ANIMATIONS
   ======================================== */

.section-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--ease-out);
}

.section-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Fade in animation */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Slide up animation */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

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

/* Display */
.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.grid { display: grid; }

/* Colors */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-accent { color: var(--color-accent); }
.text-light { color: var(--color-text-light); }

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-surface { background-color: var(--color-surface); }

/* Spacing */
.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); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.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); }
.mt-xl { margin-top: var(--spacing-xl); }

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    /* Navigation Mobile */
    nav .container {
        flex-wrap: wrap;
        position: relative;
    }

    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        top: 50%;
        right: var(--spacing-md);
        transform: translateY(-50%);
    }

    nav ul {
        flex-direction: column;
        width: 100%;
        background: var(--color-primary-dark);
        max-height: 0;
        overflow: hidden;
        gap: 0;
        margin-top: var(--spacing-sm);
        border-radius: var(--radius-md);
    }

    nav ul.active {
        max-height: 500px;
        padding: var(--spacing-sm) 0;
    }

    nav ul li {
        width: 100%;
    }

    nav ul li a {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: 0;
        min-height: 48px;
        display: flex;
        align-items: center;
    }

    nav ul li.nav-cta {
        margin-left: 0;
        padding: 0 var(--spacing-md);
    }

    nav ul li.nav-cta .nav-resume-btn {
        width: 100%;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
    }

    nav ul li a:hover {
        transform: translateY(0);
        background: rgba(255, 255, 255, 0.15);
    }

    /* Footer Mobile */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }

    /* Sections */
    section {
        padding: var(--spacing-xl) 0;
    }

    section.compact {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-3xl: 4rem;
        --spacing-2xl: 3rem;
    }

    .container {
        width: 95%;
        padding: 0 var(--spacing-sm);
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

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

/* Reduced motion for users who prefer it */
@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;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text: #000000;
        --color-background: #ffffff;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    nav,
    footer,
    .cta-buttons,
    .menu-toggle {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    a {
        text-decoration: underline;
    }
}