/* ============================================
   A-Z Stone Works — Custom Styles
   ============================================ */

/* --- Custom Color Palette --- */
:root {
    --midnight-950: #020814;
    --midnight-900: #0B1D3A;
    --midnight-800: #112D54;
    --midnight-700: #1A4678;
    --midnight-600: #2563A0;
    --midnight-500: #3B82C4;
    --midnight-400: #60A5E0;
    --midnight-300: #93C5FD;
    --midnight-200: #BFDBFE;
    --midnight-100: #DBEAFE;
    --midnight-50: #EFF6FF;
    
    --mint-450: #2DD4BF;
    --mint-400: #5EEAD4;
    --mint-350: #6EE7B7;
    --mint-300: #A7F3D0;
    --mint-200: #CFFAFE;
    --mint-100: #ECFDF5;
    --mint-700: #0F766E;
    --mint-600: #0D9488;
    --mint-500: #14B8A6;
}

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

body {
    overflow-x: hidden;
}

::selection {
    background-color: var(--mint-300);
    color: var(--midnight-950);
}

/* --- Navigation --- */
.nav-header {
    transition: box-shadow 0.3s ease;
}

.nav-header.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--mint-400);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link:focus::after {
    width: 100%;
}

/* Mobile menu */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

#mobile-menu.closed {
    opacity: 0;
    pointer-events: none;
}

.mobile-nav-link {
    position: relative;
}

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--mint-400);
    transition: width 0.3s ease;
}

.mobile-nav-link:hover::after {
    width: 80%;
}

/* --- Buttons --- */
.btn-primary {
    background: var(--mint-400);
    color: var(--midnight-950);
    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.75rem 1.75rem;
    border-radius: 0;
    border: 2px solid var(--mint-400);
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover,
.btn-primary:focus {
    background: transparent;
    color: var(--mint-400);
    border-color: var(--mint-400);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(94, 234, 212, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--mint-400);
    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.75rem 1.75rem;
    border-radius: 0;
    border: 2px solid var(--mint-400);
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover,
.btn-secondary:focus {
    background: var(--mint-400);
    color: var(--midnight-950);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(94, 234, 212, 0.2);
}

/* --- Hero --- */
.hero {
    position: relative;
}

.hero-bg {
    will-change: transform;
}

.hero-img {
    will-change: transform;
}

.hero-content {
    padding-top: 5rem;
}

.hero-eyebrow {
    opacity: 0;
    animation: heroFadeUp 0.8s ease forwards;
    animation-delay: 0.2s;
}

.hero-headline {
    opacity: 0;
    animation: heroFadeUp 0.8s ease forwards;
    animation-delay: 0.4s;
}

.hero-subtext {
    opacity: 0;
    animation: heroFadeUp 0.8s ease forwards;
    animation-delay: 0.6s;
}

.hero-ctas {
    opacity: 0;
    animation: heroFadeUp 0.8s ease forwards;
    animation-delay: 0.8s;
}

.hero-stat {
    opacity: 0;
    animation: heroFadeUp 0.6s ease forwards;
}

.hero-stat:nth-child(1) { animation-delay: 1.0s; }
.hero-stat:nth-child(2) { animation-delay: 1.1s; }
.hero-stat:nth-child(3) { animation-delay: 1.2s; }
.hero-stat:nth-child(4) { animation-delay: 1.3s; }

@keyframes heroFadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Section Layout --- */
.section {
    position: relative;
}

.section-header {
    margin-bottom: 4rem;
}

.section-eyebrow {
    display: block;
}

.section-title {
    font-family: 'Playfair Display', Georgia, serif;
}

.section-subtitle {
    font-family: 'Inter', system-ui, sans-serif;
}

/* --- Service Cards --- */
.service-card {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    padding: 2rem;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--mint-400);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    border-color: transparent;
}

.service-card-img {
    position: relative;
    overflow: hidden;
}

.service-card-img-inner {
    transition: transform 0.6s ease;
}

.service-card:hover .service-card-img-inner {
    transform: scale(1.05);
}

/* --- Process Steps --- */
.process-step {
    position: relative;
}

.process-step-circle {
    transition: all 0.3s ease;
}

.process-step:hover .process-step-circle {
    background: var(--mint-400);
    border-color: var(--mint-400);
}

.process-step:hover .process-step-circle span {
    color: var(--midnight-950);
}

/* --- Gallery --- */
.gallery-item {
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.gallery-item-img {
    position: relative;
    overflow: hidden;
}

.gallery-item-img-inner {
    transition: transform 0.6s ease;
}

.gallery-item:hover .gallery-item-img-inner {
    transform: scale(1.05);
}

.gallery-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0;
    background: linear-gradient(to top, rgba(2, 8, 20, 0.7), transparent);
    transition: height 0.4s ease;
    z-index: 1;
}

.gallery-item:hover::after {
    height: 40%;
}

.gallery-item-info {
    position: relative;
    z-index: 2;
}

/* --- Testimonials --- */
.testimonial-card {
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(94, 234, 212, 0.3);
    transform: translateY(-4px);
}

/* --- Contact Form --- */
.form-input {
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 0.9375rem;
    color: var(--midnight-950);
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.15);
    padding: 0.75rem 1rem;
    border-radius: 0;
    transition: all 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: var(--mint-400);
    box-shadow: 0 0 0 3px rgba(94, 234, 212, 0.15);
}

.form-input::placeholder {
    color: rgba(0, 0, 0, 0.35);
}

.form-input.invalid {
    border-color: #EF4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-success {
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--mint-400);
    color: var(--midnight-950);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 50;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--midnight-950);
    color: var(--mint-400);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* --- Reveal Animations (progressive enhancement) --- */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(40px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    
    .reveal:nth-child(2) { transition-delay: 0.1s; }
    .reveal:nth-child(3) { transition-delay: 0.2s; }
    .reveal:nth-child(4) { transition-delay: 0.3s; }
}

/* --- Responsive --- */
@media (max-width: 767px) {
    .hero-content {
        padding-top: 4rem;
    }
    
    .hero-headline {
        font-size: 2.75rem;
    }
    
    .hero-subtext {
        font-size: 1rem;
    }
    
    .section {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
    
    .section-title {
        font-size: 2.25rem;
    }
    
    .service-card {
        padding: 1.5rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .section {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

/* --- Focus visible for accessibility --- */
*:focus-visible {
    outline: 2px solid var(--mint-400);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--mint-400);
    outline-offset: 2px;
}