/* =========================================
   ProFx AI - Premium Institutional Style
   ========================================= */

:root {
    /* Colors */
    --bg-body: #0B0F14;
    --bg-surface: #0B0F14;
    --bg-card: #0F1622;
    --border-card: rgba(255, 255, 255, 0.08);
    
    --text-primary: #EAF0F6;
    --text-secondary: rgba(234, 240, 246, 0.72);
    --text-tertiary: rgba(234, 240, 246, 0.48);
    
    --accent-primary: #19C3FF;  /* Cyan */
    --accent-secondary: #7C5CFF; /* Violet */
    --accent-hover: #14A0D2;
    
    --success: #00D1FF;
    --warning: #FFD166;
    --danger: #FF5C5C;

    /* Spacing Scale */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-6: 48px;
    --space-8: 64px;
    --space-12: 96px;
    
    /* Typography */
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --font-heading: var(--font-stack);
    
    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-pill: 9999px;
    
    /* Shadows */
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 8px 30px rgba(25, 195, 255, 0.15);
    
    /* Layout */
    --container-width: 1200px;
    --header-height: 80px;
}

/* =========================================
   Reset & Base
   ========================================= */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-stack);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-bottom: var(--space-2);
    font-weight: 600;
    color: var(--text-primary);
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1.75rem; letter-spacing: -0.01em; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-3);
    color: var(--text-secondary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

/* =========================================
   Utility Classes
   ========================================= */

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-3);
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-cyan { color: var(--accent-primary); }
.text-white { color: #fff; }
.text-muted { color: var(--text-secondary); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

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

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 980px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
}

/* =========================================
   Components
   ========================================= */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--space-4);
    height: 48px;
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #000;
}
.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(25, 195, 255, 0.3);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--border-card);
    color: var(--text-primary);
}
.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-tertiary {
    background: transparent;
    color: var(--text-secondary);
    padding: 0;
    height: auto;
}
.btn-tertiary:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.btn-sm {
    height: 36px;
    padding: 0 var(--space-3);
    font-size: 0.875rem;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Badge/Pill */
.pill {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(25, 195, 255, 0.1);
    color: var(--accent-primary);
    border-radius: var(--radius-pill);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-2);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Section */
section {
    padding: var(--space-12) 0;
}

.section-dark {
    background-color: #080B0F;
}

/* =========================================
   Header & Nav
   ========================================= */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(11, 15, 20, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--space-4);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 0;
    position: relative;
}

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

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 760px) {
    .nav-links.desktop-only { display: none; }
    .mobile-menu-btn { display: block; }
    .header-cta { display: none; }
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--bg-card);
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-card);
    transform: translateY(-150%);
    transition: transform 0.3s ease-in-out;
    z-index: 999;
}

.mobile-menu.active {
    transform: translateY(0);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-2) 0;
    font-size: 1.1rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.mobile-nav-link:last-child { border-bottom: none; }

/* =========================================
   Home Specifics
   ========================================= */

.hero {
    padding-top: calc(var(--header-height) + var(--space-12));
    padding-bottom: var(--space-12);
    background: radial-gradient(circle at top center, rgba(25, 195, 255, 0.08) 0%, transparent 50%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.trust-bar {
    padding: var(--space-4) 0;
    border-top: 1px solid var(--border-card);
    border-bottom: 1px solid var(--border-card);
    margin-bottom: var(--space-8);
}

.trust-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-6);
    opacity: 0.5;
}

.trust-item {
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: 0.05em;
}

.feature-step {
    padding: var(--space-4);
    position: relative;
    border-left: 2px solid var(--border-card);
    margin-left: var(--space-2);
}

.feature-step.active {
    border-color: var(--accent-primary);
}

.step-num {
    position: absolute;
    left: -11px;
    top: var(--space-4);
    width: 20px;
    height: 20px;
    background: var(--bg-body);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
}

/* =========================================
   Performance & Blog
   ========================================= */

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--space-1);
}

.metric-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.post-card h3 {
    margin-bottom: var(--space-2);
    font-size: 1.5rem;
}

/* =========================================
   Inputs & Forms
   ========================================= */

.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    margin-bottom: var(--space-1);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input, .form-textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(25, 195, 255, 0.05);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* =========================================
   Footer
   ========================================= */

.footer {
    background-color: #080B0F;
    border-top: 1px solid var(--border-card);
    padding: var(--space-12) 0 var(--space-6);
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

@media (max-width: 760px) {
    .footer-grid { grid-template-columns: 1fr;}
}

.footer-title {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.footer-link {
    display: block;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.footer-link:hover {
    color: var(--accent-primary);
}

.disclaimer {
    border-top: 1px solid var(--border-card);
    padding-top: var(--space-4);
    color: var(--text-tertiary);
    font-size: 0.8rem;
    line-height: 1.5;
}