/* ============================================
   IFB Metals - Rare Earth Manufacturing
   styles.css — Complete Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
    --color-bg-primary: #0D0D0D;
    --color-bg-secondary: #141414;
    --color-bg-card: #1A1A1A;
    --color-bg-card-hover: #222222;

    --color-gold: #C9A84C;
    --color-gold-light: #D4B96A;
    --color-gold-muted: rgba(201, 168, 76, 0.15);
    --color-gold-border: rgba(201, 168, 76, 0.3);

    --color-text: #F5F5F0;
    --color-text-secondary: #A0A0A0;
    --color-text-tertiary: #6B6B6B;

    --color-error: #E74C3C;
    --color-success: #2ECC71;

    --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --fs-h1: clamp(2.5rem, 5vw, 4rem);
    --fs-h2: clamp(2rem, 4vw, 3rem);
    --fs-h3: clamp(1.25rem, 2vw, 1.5rem);
    --fs-body: clamp(1rem, 1.2vw, 1.125rem);
    --fs-small: 0.875rem;

    --fw-regular: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    --container-max: 1200px;
    --container-pad: 1.5rem;
    --nav-height: 72px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition-fast: 200ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    --shadow-card: 0 2px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 30px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-stack);
    font-size: var(--fs-body);
    font-weight: var(--fw-regular);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-gold);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-gold-light);
}

ul {
    list-style: none;
}

/* --- Utilities --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-pad);
}

.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-sm);
    background: var(--color-gold);
    color: var(--color-bg-primary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-weight: var(--fw-semibold);
}

.skip-link:focus {
    top: var(--space-sm);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header h2 {
    font-size: var(--fs-h2);
    font-weight: var(--fw-bold);
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.section-subtitle {
    font-size: var(--fs-body);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.gold-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    border: none;
    margin: 0;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-family: var(--font-stack);
    font-size: var(--fs-small);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.btn-primary {
    background: var(--color-gold);
    color: var(--color-bg-primary);
}

.btn-primary:hover {
    background: var(--color-gold-light);
    color: var(--color-bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(201, 168, 76, 0.3);
}

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

.btn-outline:hover {
    background: var(--color-gold-muted);
    color: var(--color-gold-light);
}

/* ============================================
   NAVIGATION
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 100;
    background: rgba(13, 13, 13, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-base);
    border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
    background: rgba(13, 13, 13, 0.95);
    border-bottom-color: var(--color-gold-border);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-pad);
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo img {
    height: 56px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-link {
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    color: var(--color-text-secondary);
    letter-spacing: 0.03em;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-gold);
    transition: width var(--transition-base);
}

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

.nav-link.is-active::after {
    width: 100%;
}

.nav-cta {
    background: var(--color-gold);
    color: var(--color-bg-primary) !important;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    background: var(--color-gold-light);
    color: var(--color-bg-primary) !important;
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--color-bg-primary);
    overflow: hidden;
    padding-top: var(--nav-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(201, 168, 76, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(201, 168, 76, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(201, 168, 76, 0.03) 0%, transparent 40%);
    z-index: 0;
}

/* Subtle animated grid pattern */
.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(201, 168, 76, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(201, 168, 76, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero h1 {
    font-size: var(--fs-h1);
    font-weight: var(--fw-bold);
    line-height: 1.15;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.hero h1 span {
    color: var(--color-gold);
}

.hero-subtext {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
    max-width: 620px;
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-gold-border);
    border-radius: 100px;
    font-size: var(--fs-small);
    color: var(--color-text-secondary);
}

.hero-badge svg {
    width: 16px;
    height: 16px;
    fill: var(--color-gold);
    flex-shrink: 0;
}

/* ============================================
   ABOUT
   ============================================ */
.about {
    padding: var(--space-xl) 0;
    background: var(--color-bg-primary);
}

.about-intro {
    max-width: 720px;
    margin: 0 auto var(--space-lg);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--fs-body);
    line-height: 1.8;
}

.value-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.value-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-gold-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.value-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-gold);
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

.value-card:hover::before {
    opacity: 1;
}

.value-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-sm);
    color: var(--color-gold);
}

.value-card-icon svg {
    width: 36px;
    height: 36px;
    stroke: var(--color-gold);
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.value-card h3 {
    font-size: var(--fs-h3);
    font-weight: var(--fw-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.value-card p {
    color: var(--color-text-secondary);
    font-size: var(--fs-small);
    line-height: 1.7;
}

/* ============================================
   LOCATIONS
   ============================================ */
.locations {
    padding: var(--space-xl) 0;
    background: var(--color-bg-secondary);
}

.locations-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.location-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-gold-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.location-card-header {
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    border-bottom: 1px solid rgba(201, 168, 76, 0.1);
}

.location-card-header svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-gold);
    fill: none;
    stroke-width: 1.5;
    flex-shrink: 0;
}

.location-card-header h3 {
    font-size: var(--fs-h3);
    font-weight: var(--fw-semibold);
    color: var(--color-gold);
}

.location-card-content {
    padding: var(--space-md);
}

.location-card address {
    font-style: normal;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.location-city {
    color: var(--color-text-secondary);
    font-size: var(--fs-body);
    font-weight: var(--fw-medium);
}

/* ============================================
   CONTACT
   ============================================ */
.contact {
    padding: var(--space-xl) 0;
    background: var(--color-bg-primary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

/* Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.form-group label span {
    color: var(--color-gold);
}

.form-group input,
.form-group textarea {
    background: var(--color-bg-card);
    border: 1px solid var(--color-gold-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-family: var(--font-stack);
    font-size: var(--fs-body);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
    width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-gold);
    box-shadow: 0 0 0 3px var(--color-gold-muted);
}

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

.form-group.has-error input,
.form-group.has-error textarea {
    border-color: var(--color-error);
}

.form-error {
    font-size: 0.8rem;
    color: var(--color-error);
    margin-top: 2px;
}

.form-success {
    padding: var(--space-md);
    background: rgba(46, 204, 113, 0.1);
    border: 1px solid rgba(46, 204, 113, 0.3);
    border-radius: var(--radius-md);
    color: var(--color-success);
    text-align: center;
    font-weight: var(--fw-medium);
}

/* Contact info sidebar */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-info-block h3 {
    font-size: var(--fs-h3);
    font-weight: var(--fw-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-xs);
    position: relative;
    padding-bottom: var(--space-xs);
}

.contact-info-block h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-gold);
}

.contact-info-block p {
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.contact-info-block a {
    color: var(--color-text-secondary);
}

.contact-info-block a:hover {
    color: var(--color-gold);
}

.contact-info-block address {
    font-style: normal;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-top: var(--space-xs);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background: var(--color-bg-secondary);
    padding-top: var(--space-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding-bottom: var(--space-lg);
}

.footer-brand p {
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
    font-size: var(--fs-small);
    max-width: 300px;
}

.footer-brand .footer-logo {
    display: inline-block;
}

.footer-brand .footer-logo img {
    height: 44px;
    width: auto;
}

.footer-nav h4,
.footer-contact h4 {
    font-size: var(--fs-small);
    font-weight: var(--fw-semibold);
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-sm);
}

.footer-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-nav a {
    color: var(--color-text-secondary);
    font-size: var(--fs-small);
}

.footer-nav a:hover {
    color: var(--color-gold);
}

.footer-contact p {
    color: var(--color-text-secondary);
    font-size: var(--fs-small);
    margin-bottom: var(--space-xs);
}

.footer-contact a {
    color: var(--color-text-secondary);
}

.footer-contact a:hover {
    color: var(--color-gold);
}

.footer-bottom {
    border-top: 1px solid rgba(201, 168, 76, 0.15);
    padding: var(--space-sm) 0;
}

.footer-bottom p {
    text-align: center;
    font-size: var(--fs-small);
    color: var(--color-text-tertiary);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delay for grid children */
.value-cards .animate-on-scroll:nth-child(2) { transition-delay: 100ms; }
.value-cards .animate-on-scroll:nth-child(3) { transition-delay: 200ms; }
.value-cards .animate-on-scroll:nth-child(4) { transition-delay: 300ms; }

.locations-grid .animate-on-scroll:nth-child(2) { transition-delay: 100ms; }
.locations-grid .animate-on-scroll:nth-child(3) { transition-delay: 200ms; }

/* ============================================
   RESPONSIVE — TABLET (768px+)
   ============================================ */
@media (min-width: 768px) {
    .value-cards {
        grid-template-columns: repeat(2, 1fr);
    }

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

    /* Make the 3rd location card span full width when 2 cols */
    .locations-grid .location-card:last-child:nth-child(odd) {
        grid-column: 1 / -1;
        max-width: 50%;
        justify-self: center;
    }

    .contact-grid {
        grid-template-columns: 3fr 2fr;
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

/* ============================================
   RESPONSIVE — DESKTOP (1024px+)
   ============================================ */
@media (min-width: 1024px) {
    .value-cards {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .locations-grid .location-card:last-child:nth-child(odd) {
        max-width: 100%;
        grid-column: auto;
    }
}

/* ============================================
   RESPONSIVE — MOBILE NAV (below 768px)
   ============================================ */
@media (max-width: 767px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: flex-start;
        padding-top: var(--space-lg);
        gap: var(--space-md);
        background: rgba(13, 13, 13, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: 99;
    }

    .nav-menu.is-open {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 1.125rem;
        text-align: center;
    }

    .nav-cta {
        align-self: center;
        font-size: var(--fs-small);
    }
}

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

    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }
}