/* ===================================
   FIRST AVENUE INTERIOR
   Dark Luxury Design System
   =================================== */

/* ===================================
   CSS Variables
   =================================== */
:root {
    --gold: #C9A96E;
    --gold-light: #D4B87A;
    --gold-dark: #B89A5F;
    --dark: #1A1A1A;
    --dark-light: #2A2A2A;
    --dark-lighter: #3A3A3A;
    --white: #FFFFFF;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
}

/* ===================================
   Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--dark);
    color: var(--white);
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background-color: var(--gold);
    color: var(--dark);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark);
}

::-webkit-scrollbar-thumb {
    background: var(--gold);
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gold-light);
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    line-height: 1.2;
}

/* ===================================
   Gold Line Divider
   =================================== */
.gold-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.gold-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    margin: 0 auto;
    max-width: 600px;
}

/* ===================================
   Navigation
   =================================== */
.nav-link {
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    position: relative;
    transition: color 0.3s ease;
}

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

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

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

/* ===================================
   Buttons
   =================================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    background-color: var(--gold);
    color: var(--dark);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 2px solid var(--gold);
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--gold);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(201, 169, 110, 0.2);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    background-color: transparent;
    color: var(--gold);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 2px solid var(--gold);
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-outline:hover {
    background-color: var(--gold);
    color: var(--dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(201, 169, 110, 0.2);
}

.btn-outline-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    color: var(--gold);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--gold);
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-outline-sm:hover {
    background-color: var(--gold);
    color: var(--dark);
}

/* ===================================
   Cards
   =================================== */
.project-card {
    position: relative;
    overflow: hidden;
    background-color: var(--dark-light);
    border: 1px solid rgba(201, 169, 110, 0.2);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gold);
    transform: scaleX(0);
    transition: transform 0.5s ease;
}

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

.service-card {
    padding: 2rem;
    background-color: var(--dark);
    border: 1px solid rgba(201, 169, 110, 0.2);
    transition: all 0.3s ease;
}

.service-card:hover {
    border-color: var(--gold);
    transform: translateY(-5px);
}

.service-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--gold);
    border: 1px solid rgba(201, 169, 110, 0.3);
    transition: all 0.3s ease;
}

.service-card:hover .service-icon {
    background-color: var(--gold);
    color: var(--dark);
    border-color: var(--gold);
}

.testimonial-card {
    padding: 2rem;
    background-color: var(--dark);
    border: 1px solid rgba(201, 169, 110, 0.2);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-family: 'Playfair Display', serif;
    font-size: 4rem;
    color: rgba(201, 169, 110, 0.1);
    line-height: 1;
}

.philosophy-card {
    padding: 2rem;
    border-left: 2px solid var(--gold);
}

.team-card {
    text-align: center;
}

.pricing-card {
    padding: 2.5rem;
    background-color: var(--dark);
    border: 1px solid rgba(201, 169, 110, 0.2);
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    border-color: var(--gold);
    transform: translateY(-5px);
}

.pricing-card.featured {
    border-color: var(--gold);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.07);
}

.contact-card {
    padding: 1.5rem;
    background-color: var(--dark);
    border: 1px solid rgba(201, 169, 110, 0.2);
    transition: all 0.3s ease;
}

.contact-card:hover {
    border-color: var(--gold);
}

.quick-consult-card {
    padding: 2rem;
    background-color: var(--dark-light);
    border: 1px solid rgba(201, 169, 110, 0.2);
    transition: all 0.3s ease;
}

.quick-consult-card:hover {
    border-color: var(--gold);
    transform: translateY(-5px);
}

/* ===================================
   Process Section
   =================================== */
.process-card {
    text-align: center;
    padding: 2rem 1rem;
    position: relative;
}

.process-number {
    font-family: 'Playfair Display', serif;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(201, 169, 110, 0.2);
    margin-bottom: 1rem;
}

.process-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--gold);
    border: 2px solid var(--gold);
    transition: all 0.3s ease;
}

.process-card:hover .process-icon {
    background-color: var(--gold);
    color: var(--dark);
}

/* ===================================
   Gallery
   =================================== */
.filter-btn {
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    color: var(--gray-400);
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    border: 1px solid rgba(201, 169, 110, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--gold);
    color: var(--dark);
    border-color: var(--gold);
}

.gallery-item {
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.gallery-item.hidden {
    display: none;
}

/* ===================================
   FAQ
   =================================== */
.faq-item {
    background-color: var(--dark);
    border: 1px solid rgba(201, 169, 110, 0.2);
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--gold);
}

.faq-question {
    background: none;
    border: none;
    color: var(--white);
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

/* ===================================
   Forms
   =================================== */
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 1rem;
    background-color: var(--dark);
    border: 1px solid rgba(201, 169, 110, 0.3);
    color: var(--white);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 2px rgba(201, 169, 110, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--gray-500);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23C9A96E' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 3rem;
}

.form-select option {
    background-color: var(--dark);
    color: var(--white);
}

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

/* ===================================
   Lightbox
   =================================== */
#lightbox {
    opacity: 0;
    transition: opacity 0.3s ease;
}

#lightbox.active {
    display: flex;
    opacity: 1;
}

/* ===================================
   Counter Animation
   =================================== */
.counter {
    display: inline-block;
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Loading shimmer effect */
.shimmer {
    background: linear-gradient(
        90deg,
        var(--dark-light) 0%,
        var(--dark-lighter) 50%,
        var(--dark-light) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* ===================================
   Responsive Styles
   =================================== */
@media (max-width: 768px) {
    .btn-primary,
    .btn-outline {
        padding: 0.875rem 1.5rem;
        font-size: 0.875rem;
    }

    .service-card,
    .testimonial-card,
    .pricing-card,
    .contact-card {
        padding: 1.5rem;
    }

    .process-number {
        font-size: 2rem;
    }

    .process-icon {
        width: 60px;
        height: 60px;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
}

@media (max-width: 640px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .gold-line {
        width: 40px;
    }
}

/* ===================================
   Utility Classes
   =================================== */
.text-gold {
    color: var(--gold);
}

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

.border-gold {
    border-color: var(--gold);
}

/* Hover lift effect */
.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Image grayscale to color on hover */
.grayscale-hover {
    filter: grayscale(100%);
    transition: filter 0.5s ease;
}

.grayscale-hover:hover {
    filter: grayscale(0%);
}

/* Gold border glow */
.gold-glow {
    box-shadow: 0 0 20px rgba(201, 169, 110, 0.3);
}

/* Smooth scroll target offset for fixed nav */
[id] {
    scroll-margin-top: 100px;
}