/* ==============================================================================
   RICSON RAMOS | DATA SCIENCE & ANALYTICS ENGINEERING PORTFOLIO (2026)
   Modern, Ultra-Fast, Responsive & Minimalist Stylesheet
   Zero render-blocking dependencies • High Contrast • 60fps Transitions
   Dark Mode & Light Mode • Multilingual Ready
   ============================================================================== */

:root,
[data-theme="dark"] {
    /* Color Palette (Deep Obsidian / Slate Navy) */
    --bg-main: #07090e;
    --bg-surface: #0e131f;
    --bg-surface-elevated: #141b2d;
    --bg-surface-hover: #1c263d;
    
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(56, 189, 248, 0.35);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-cyan: #38bdf8;
    --accent-indigo: #818cf8;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    
    --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
    
    --navbar-bg: rgba(7, 9, 14, 0.85);
    --body-radial-1: rgba(56, 189, 248, 0.08);
    --body-radial-2: rgba(129, 140, 248, 0.05);
    --card-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    --card-hover-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
    --pill-bg: rgba(255, 255, 255, 0.04);
    --story-item-bg: rgba(0, 0, 0, 0.25);
    --btn-outline-bg: rgba(255, 255, 255, 0.04);
    --btn-outline-hover-bg: rgba(255, 255, 255, 0.08);
    --btn-outline-hover-border: rgba(255, 255, 255, 0.2);
    --btn-outline-hover-text: #ffffff;
    --btn-primary-text: #07090e;
    --section-alt-bg: rgba(255, 255, 255, 0.01);
    --status-badge-bg: rgba(16, 185, 129, 0.1);
    --status-badge-border: rgba(16, 185, 129, 0.25);
    --status-badge-text: #34d399;
    --hero-title-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    --control-bg: rgba(255, 255, 255, 0.05);
    --control-hover-bg: rgba(255, 255, 255, 0.1);
    --control-border: rgba(255, 255, 255, 0.1);
    
    /* Shared Storytelling & Case Study Tokens */
    --color-accent: var(--accent-cyan);
    --color-accent-glow: rgba(56, 189, 248, 0.35);
    --color-bg: var(--bg-main);
    --color-surface: var(--bg-surface);
    --color-text: var(--text-primary);
    --color-text-dim: var(--text-secondary);
    --transition-smooth: var(--transition-normal);
    --tech-icon-filter: brightness(0) invert(1);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "JetBrains Mono", monospace;
    
    /* Spacing & Layout */
    --container-max: 1200px;
    --nav-height: 72px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-pill: 9999px;
    
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
    /* Color Palette (Clean Slate / Crisp Pure Light) */
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --bg-surface-hover: #e2e8f0;
    
    --border-subtle: rgba(15, 23, 42, 0.09);
    --border-hover: rgba(2, 132, 199, 0.45);
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    --accent-cyan: #0284c7;
    --accent-indigo: #4f46e5;
    --accent-emerald: #059669;
    --accent-amber: #d97706;
    
    --gradient-accent: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
    --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(248, 250, 252, 1) 100%);
    
    --navbar-bg: rgba(248, 250, 252, 0.9);
    --body-radial-1: rgba(2, 132, 199, 0.07);
    --body-radial-2: rgba(79, 70, 229, 0.05);
    --card-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
    --card-hover-shadow: 0 12px 30px rgba(15, 23, 42, 0.1);
    --pill-bg: #f1f5f9;
    --story-item-bg: #f8fafc;
    --btn-outline-bg: #ffffff;
    --btn-outline-hover-bg: #f1f5f9;
    --btn-outline-hover-border: rgba(15, 23, 42, 0.25);
    --btn-outline-hover-text: #0f172a;
    --btn-primary-text: #ffffff;
    --section-alt-bg: #f1f5f9;
    --status-badge-bg: rgba(5, 150, 105, 0.08);
    --status-badge-border: rgba(5, 150, 105, 0.2);
    --status-badge-text: #059669;
    --hero-title-gradient: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
    --control-bg: #ffffff;
    --control-hover-bg: #e2e8f0;
    --control-border: rgba(15, 23, 42, 0.12);

    /* Shared Storytelling & Case Study Tokens (Light Mode) */
    --color-accent: var(--accent-cyan);
    --color-accent-glow: rgba(2, 132, 199, 0.25);
    --color-bg: var(--bg-main);
    --color-surface: var(--bg-surface);
    --color-text: var(--text-primary);
    --color-text-dim: var(--text-secondary);
    --transition-smooth: var(--transition-normal);
    --tech-icon-filter: brightness(0) opacity(0.8);
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    min-height: 100vh;
    background: radial-gradient(circle at 50% 0%, var(--body-radial-1) 0%, transparent 40%),
                radial-gradient(circle at 85% 30%, var(--body-radial-2) 0%, transparent 35%),
                var(--bg-main);
    overflow-x: hidden;
    color: var(--text-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: clamp(1rem, 4vw, 2rem);
    padding-right: clamp(1rem, 4vw, 2rem);
}

/* Section Styling */
.section {
    padding-top: clamp(4rem, 8vw, 7rem);
    padding-bottom: clamp(4rem, 8vw, 7rem);
}

.section-alt {
    background: var(--section-alt-bg);
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto clamp(2.5rem, 5vw, 4rem);
}

.section-tag {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: clamp(1.875rem, 4vw, 2.75rem);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Sticky Glass Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: var(--navbar-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
    flex-shrink: 0;
}

.nav-brand-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: var(--radius-pill);
    box-shadow: 0 0 10px var(--accent-cyan);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.75rem;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-cyan);
    border-radius: var(--radius-pill);
}

/* Nav Actions & Controls */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Language Switcher */
.lang-switch {
    display: inline-flex;
    align-items: center;
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    border-radius: var(--radius-pill);
    padding: 3px 5px;
    gap: 2px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition-fast);
}

.lang-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-muted);
    padding: 4px 8px;
    border-radius: var(--radius-pill);
    transition: var(--transition-fast);
    line-height: 1;
}

.lang-btn:hover {
    color: var(--text-primary);
}

.lang-btn.active {
    background: var(--accent-cyan);
    color: var(--btn-primary-text);
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.3);
}

[data-theme="light"] .lang-btn.active {
    box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
}

.lang-divider {
    color: var(--text-muted);
    opacity: 0.4;
    font-size: 0.7rem;
    user-select: none;
    line-height: 1;
}

/* Theme Toggle Button */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-pill);
    background: var(--control-bg);
    border: 1px solid var(--control-border);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.theme-toggle:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: rotate(15deg);
}

.theme-toggle:active {
    transform: scale(0.92);
}

.theme-icon-sun,
.theme-icon-moon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

[data-theme="dark"] .theme-icon-sun {
    display: inline-flex;
}

[data-theme="dark"] .theme-icon-moon {
    display: none;
}

[data-theme="light"] .theme-icon-sun {
    display: none;
}

[data-theme="light"] .theme-icon-moon {
    display: inline-flex;
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-toggle:hover {
    color: var(--accent-cyan);
}

/* Hero Section */
.hero {
    min-height: calc(90vh - var(--nav-height));
    display: flex;
    align-items: center;
    position: relative;
    padding-top: clamp(3rem, 6vw, 5rem);
    padding-bottom: clamp(3rem, 6vw, 5rem);
}

.hero-content {
    max-width: 840px;
    margin: 0 auto;
    text-align: center;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--status-badge-bg);
    border: 1px solid var(--status-badge-border);
    color: var(--status-badge-text);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-pill);
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: 2rem;
    transition: var(--transition-fast);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--status-badge-text);
    position: relative;
}

.pulse-dot::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.25rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.hero-role {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.1875rem);
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 680px;
    margin: 0 auto 2.5rem;
}

.hero-description strong {
    color: var(--text-primary);
    font-weight: 600;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: clamp(3rem, 6vw, 5rem);
}

/* Modern Accessible Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-pill);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--accent-cyan);
    color: var(--btn-primary-text);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.25);
}

[data-theme="light"] .btn-primary {
    box-shadow: 0 4px 15px rgba(2, 132, 199, 0.25);
}

.btn-primary:hover {
    filter: brightness(1.1);
    box-shadow: 0 6px 25px rgba(56, 189, 248, 0.4);
    transform: translateY(-2px);
}

[data-theme="light"] .btn-primary:hover {
    background: #0369a1;
    box-shadow: 0 6px 20px rgba(2, 132, 199, 0.35);
}

.btn-outline {
    background: var(--btn-outline-bg);
    border-color: var(--border-subtle);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--btn-outline-hover-bg);
    border-color: var(--btn-outline-hover-border);
    color: var(--btn-outline-hover-text);
    transform: translateY(-2px);
}

/* Value Props Metrics Strip */
.value-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    width: 100%;
    margin-top: 2rem;
}

.value-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    text-align: left;
    transition: var(--transition-fast);
    box-shadow: var(--card-shadow);
}

.value-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--card-hover-shadow);
}

.value-card-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--accent-cyan);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.value-card-header span:first-child {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
}

.value-card-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.value-card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Category Filter Tabs */
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.filter-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-pill);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.filter-btn.active {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: var(--btn-primary-text);
    font-weight: 600;
    box-shadow: 0 2px 10px rgba(56, 189, 248, 0.3);
}

[data-theme="light"] .filter-btn.active {
    box-shadow: 0 2px 10px rgba(2, 132, 199, 0.25);
}

/* Project Showcase Grid (Responsive 2-Col / 1-Col) */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 540px), 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
    position: relative;
    box-shadow: var(--card-shadow);
}

.project-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--card-hover-shadow);
    transform: translateY(-4px);
}

.project-image-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--bg-surface-elevated);
    overflow: hidden;
    border-bottom: 1px solid var(--border-subtle);
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    transition: transform 0.5s ease;
}

.project-card:hover .project-image {
    transform: scale(1.03);
}

.project-body {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.project-category {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-badge-roi {
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--status-badge-bg);
    border: 1px solid var(--status-badge-border);
    color: var(--status-badge-text);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-pill);
}

.project-title {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

/* Storytelling Points inside card */
.story-block {
    background: var(--story-item-bg);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.story-item {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.story-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Tech Tags */
.tech-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-pill {
    background: var(--pill-bg);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    font-weight: 500;
}

/* Project Actions */
.project-actions {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}

.project-actions .btn {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    flex: 1;
    justify-content: center;
}

/* Timeline & Experience */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-subtle);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 0.375rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-main);
    border: 3px solid var(--accent-cyan);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
    transition: background-color var(--transition-fast);
}

.timeline-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition-fast);
    box-shadow: var(--card-shadow);
}

.timeline-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--card-hover-shadow);
}

.timeline-period {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 0.25rem;
    font-family: var(--font-mono);
}

.timeline-role {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.timeline-company {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.timeline-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Philosophy / How I Work */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.philosophy-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: var(--transition-fast);
    box-shadow: var(--card-shadow);
}

.philosophy-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--card-hover-shadow);
}

.philosophy-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--pill-bg);
    color: var(--accent-cyan);
    margin-bottom: 1.25rem;
}

.philosophy-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.philosophy-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Contact Section */
.contact-card {
    max-width: 680px;
    margin: 0 auto;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: clamp(2rem, 5vw, 3.5rem);
    text-align: center;
    box-shadow: var(--card-shadow);
}

.contact-links-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-subtle);
    padding: 2.5rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

/* Responsive Media Queries */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-surface);
        border-bottom: 1px solid var(--border-subtle);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        transform: translateY(-150%);
        transition: transform 0.3s ease;
        z-index: 999;
    }
    
    .nav-menu.open {
        transform: translateY(0);
        box-shadow: var(--card-hover-shadow);
    }
    
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .project-grid {
        grid-template-columns: 1fr;
    }

    .nav-brand span:not(.nav-brand-dot) {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-wrapper {
        gap: 0.5rem;
    }

    .lang-btn {
        padding: 3px 6px;
        font-size: 0.7rem;
    }

    .theme-toggle {
        width: 32px;
        height: 32px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .hero-cta .btn {
        width: 100%;
    }
}