/* assets/css/main.css */
/* ===========================================================================
   TechBasePro — itslabs.io
   Design tokens, Bootstrap overrides, base typography, layout primitives.
   Personality: clinical precision meets quiet confidence. No gradients
   (save a single subtle hero mesh), no neon, no futuristic cliché.
   =========================================================================== */

/* ---------------------------------------------------------------------------
   1. Design tokens
   --------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-bg: #090C10;
    --color-surface: #111520;
    --color-surface-2: #161B27;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-strong: rgba(255, 255, 255, 0.12);
    --color-accent: #0A8043;
    --color-accent-hover: #006C35;
    --color-accent-soft: rgba(10, 128, 67, 0.12);
    --color-link: #1FB85C;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-text-primary: #F1F5F9;
    --color-text-secondary: #94A3B8;
    --color-text-muted: #475569;

    /* Typography */
    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-base: 16px;
    --line-height-body: 1.7;
    --line-height-heading: 1.12;

    /* Fluid type scale (clamp: min, preferred, max) */
    --fs-display: clamp(2.5rem, 1.6rem + 4.2vw, 4.5rem);
    --fs-h1: clamp(2.2rem, 1.5rem + 3.2vw, 3.75rem);
    --fs-h2: clamp(1.75rem, 1.3rem + 1.9vw, 2.6rem);
    --fs-h3: clamp(1.2rem, 1.05rem + 0.7vw, 1.5rem);
    --fs-lead: clamp(1.05rem, 0.98rem + 0.4vw, 1.3rem);
    --fs-stat: clamp(3rem, 2rem + 5vw, 5.5rem);

    /* Spacing */
    --section-padding: 100px 0;
    --section-padding-mobile: 60px 0;
    --container-max: 1200px;

    /* Borders */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-pill: 100px;

    /* Shadows */
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.04);
    --shadow-card-hover: 0 8px 32px rgba(10, 128, 67, 0.15), 0 0 0 1px rgba(10, 128, 67, 0.2);
    --shadow-nav: 0 4px 24px rgba(0, 0, 0, 0.45);

    /* Transitions */
    --transition-base: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-index scale */
    --z-nav: 1030;
    --z-overlay: 1040;
    --z-modal: 1050;

    /* Bootstrap variable bridges */
    --bs-body-bg: var(--color-bg);
    --bs-body-color: var(--color-text-primary);
    --bs-body-font-family: var(--font-body);
    --bs-primary: var(--color-accent);
    --bs-border-color: var(--color-border);
    --bs-link-color: var(--color-accent);
    --bs-link-hover-color: var(--color-accent-hover);
}

/* ---------------------------------------------------------------------------
   2. Reset / base
   --------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height-body);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Anchor scroll offset for fixed navbar */
section[id],
[id].scroll-anchor {
    scroll-margin-top: 90px;
}

img,
svg {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

::selection {
    background: var(--color-accent);
    color: #fff;
}

/* Focus visibility (a11y) */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* ---------------------------------------------------------------------------
   3. Typography
   --------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3 {
    font-family: var(--font-heading);
    line-height: var(--line-height-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-top: 0;
}

h1, .display-1 {
    font-size: var(--fs-h1);
    font-weight: 700;
    letter-spacing: -0.03em;
}

h2 {
    font-size: var(--fs-h2);
}

h3 {
    font-size: var(--fs-h3);
}

p {
    margin-top: 0;
    margin-bottom: 1.25rem;
}

.lead {
    font-size: var(--fs-lead);
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-weight: 400;
}

.text-secondary-soft {
    color: var(--color-text-secondary) !important;
}

.text-muted-soft {
    color: var(--color-text-muted) !important;
}

.text-accent {
    color: var(--color-accent) !important;
}

.font-heading {
    font-family: var(--font-heading);
}

.eyebrow {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

/* Accent underline below section H2s */
.section-heading {
    position: relative;
    margin-bottom: 1.5rem;
}

.section-heading::after {
    content: "";
    display: block;
    width: 40px;
    height: 3px;
    margin-top: 1.25rem;
    background: var(--color-accent);
    border-radius: 2px;
}

.section-heading.text-center::after {
    margin-left: auto;
    margin-right: auto;
}

/* ---------------------------------------------------------------------------
   4. Layout primitives
   --------------------------------------------------------------------------- */
.container {
    max-width: var(--container-max);
}

.section {
    padding: var(--section-padding);
    position: relative;
}

@media (max-width: 768px) {
    .section {
        padding: var(--section-padding-mobile);
    }
}

/* Section background rhythm */
.section--bg {
    background-color: var(--color-bg);
}

.section--surface {
    background-color: var(--color-surface);
}

.section--dark {
    background-color: #05070A;
}

.section-intro {
    max-width: 720px;
}

.section-intro.mx-auto {
    text-align: center;
}

/* ---------------------------------------------------------------------------
   5. Buttons
   --------------------------------------------------------------------------- */
.btn {
    --bs-btn-border-radius: var(--border-radius-pill);
    font-family: var(--font-heading);
    font-weight: 500;
    letter-spacing: -0.01em;
    border-radius: var(--border-radius-pill);
    padding: 0.75rem 1.75rem;
    transition: transform var(--transition-base), background-color var(--transition-base),
        color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
    will-change: transform;
}

.btn-accent {
    background-color: var(--color-accent);
    border: 1px solid var(--color-accent);
    color: #fff;
}

.btn-accent:hover,
.btn-accent:focus-visible {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
    transform: scale(1.02);
    box-shadow: 0 8px 24px rgba(10, 128, 67, 0.35);
}

.btn-ghost {
    background-color: transparent;
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    background-color: var(--color-accent);
    color: #fff;
}

.btn-lg {
    padding: 0.95rem 2.25rem;
    font-size: 1.0625rem;
}

.btn-sm {
    padding: 0.5rem 1.15rem;
    font-size: 0.875rem;
}

/* Inline text link with arrow */
.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-accent);
}

.link-arrow svg,
.link-arrow .arrow {
    transition: transform var(--transition-base);
}

.link-arrow:hover svg,
.link-arrow:hover .arrow {
    transform: translateX(4px);
}

/* ---------------------------------------------------------------------------
   6. Cards (base — component specifics in components.css)
   --------------------------------------------------------------------------- */
.card-surface {
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth),
        border-color var(--transition-smooth);
}

/* ---------------------------------------------------------------------------
   7. Forms
   --------------------------------------------------------------------------- */
.form-control,
.form-select {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    padding: 0.85rem 1.1rem;
    font-size: 1rem;
    transition: border-color var(--transition-base), box-shadow var(--transition-base),
        background-color var(--transition-base);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

.form-control:focus,
.form-select:focus {
    background-color: var(--color-surface);
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-soft);
    color: var(--color-text-primary);
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%2394A3B8'%3e%3cpath d='M8 11L3 6h10z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 14px;
}

.form-select option {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
}

.form-label {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.form-control.is-invalid,
.form-select.is-invalid {
    border-color: #ef4444;
}

.field-error {
    display: block;
    color: #fca5a5;
    font-size: 0.825rem;
    margin-top: 0.4rem;
    min-height: 1rem;
}

/* ---------------------------------------------------------------------------
   8. Utilities
   --------------------------------------------------------------------------- */
.bg-surface {
    background-color: var(--color-surface) !important;
}

.bg-surface-2 {
    background-color: var(--color-surface-2) !important;
}

.border-soft {
    border: 1px solid var(--color-border) !important;
}

.rounded-lg {
    border-radius: var(--border-radius-lg) !important;
}

.divider {
    height: 1px;
    width: 100%;
    background: var(--color-border);
    border: 0;
}

.visually-hidden-focusable:not(:focus):not(:focus-within) {
    position: absolute !important;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
}

/* Skip link */
.skip-link {
    position: absolute;
    left: 1rem;
    top: -60px;
    z-index: var(--z-modal);
    background: var(--color-accent);
    color: #fff;
    padding: 0.6rem 1rem;
    border-radius: var(--border-radius-md);
    transition: top var(--transition-base);
}

.skip-link:focus {
    top: 1rem;
    color: #fff;
}