/* ==========================================
   Industrial Refined Design System
   Masdar Al-Adawat - Turkish Header & Base Styles
   ========================================== */

:root {
    /* Color Palette - Industrial Refined */
    --bg-primary: #0D0D0D;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #252525;
    --bg-elevated: #2D2D2D;

    --accent-primary: #D4A574;
    --accent-hover: #E5C4A1;
    --accent-glow: rgba(212, 165, 116, 0.4);
    --accent-subtle: rgba(212, 165, 116, 0.15);

    --text-primary: #F5F5F5;
    --text-secondary: #A0A0A0;
    --text-muted: #707070;

    --border-subtle: #333333;
    --border-accent: #444444;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(212, 165, 116, 0.2);

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Manrope', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --header-height: 80px;
    --container-max: 1400px;
    --section-padding: 100px;
    --gap-md: 1.5rem;
    --gap-lg: 3rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) var(--bg-secondary);
}

html::-webkit-scrollbar {
    width: 8px;
}

html::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

html::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

html::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: color var(--transition-fast);
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: inherit;
}

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

/* Utility Classes */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

.main-content {
    padding-top: 80px;
}

/* Geometric Divider */
.geometric-divider {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, transparent 0%, var(--accent-primary) 50%, transparent 100%);
}

.geometric-divider::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
}

/* ==========================================
   Header & Navigation
   ========================================== */

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: all var(--transition-smooth);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    opacity: 0.5;
}

header.scrolled {
    background: rgba(13, 13, 13, 0.95);
    box-shadow: var(--shadow-md);
}

header.header-hidden {
    transform: translateY(-100%);
}

nav {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-base);
}

.logo:hover::after {
    width: 100%;
}

.logo img {
    height: 45px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.1);
}

/* Navigation Links */
.nav-links {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
}

.nav-links > li > a {
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    position: relative;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
    transition: all var(--transition-fast);
}

.nav-links > li > a:hover {
    color: var(--accent-primary);
    background: rgba(212, 165, 116, 0.08);
}

.nav-links > li > a::after {
    display: none;
}

.nav-links > li > a.active {
    color: var(--accent-primary);
}

/* ==========================================
   Navigation Dropdown
   ========================================== */

.nav-dropdown {
    position: relative;
}

.dropdown-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.dropdown-btn:hover {
    color: var(--accent-primary);
    background: rgba(212, 165, 116, 0.08);
}

.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform var(--transition-base);
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: rgba(26, 26, 26, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: 0.75rem 0;
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-15px);
    transition: all var(--transition-smooth);
    border: 1px solid var(--border-subtle);
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    position: relative;
}

.dropdown-menu a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-fast);
}

.dropdown-menu a:hover {
    color: var(--accent-primary);
    background: rgba(212, 165, 116, 0.05);
    padding-left: 1.75rem;
}

.dropdown-menu a:hover::before {
    width: 4px;
}

/* ==========================================
   Language Dropdown
   ========================================== */

.lang-dropdown {
    position: relative;
    margin-left: 1rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    border-color: var(--accent-primary);
    background: rgba(212, 165, 116, 0.1);
}

.lang-icon {
    font-size: 1rem;
}

.lang-arrow {
    font-size: 0.65rem;
    transition: transform var(--transition-base);
}

.lang-dropdown:hover .lang-arrow {
    transform: rotate(180deg);
}

.lang-options {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: rgba(26, 26, 26, 0.98);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: 0.5rem 0;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-15px);
    transition: all var(--transition-smooth);
    border: 1px solid var(--border-subtle);
}

.lang-dropdown:hover .lang-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-options li {
    margin: 0;
}

.lang-options a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1.25rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.lang-options a:hover {
    background: rgba(212, 165, 116, 0.08);
    color: var(--accent-primary);
}

.lang-options a.active {
    background: rgba(212, 165, 116, 0.12);
    color: var(--accent-primary);
}

.lang-name {
    font-weight: 500;
    font-size: 0.875rem;
}

/* ==========================================
   Mobile Menu
   ========================================== */

.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid var(--border-subtle);
    font-size: 1.5rem;
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ==========================================
   Responsive Navigation
   ========================================== */

@media (max-width: 1200px) {
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(13, 13, 13, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        gap: 0.5rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-smooth);
        border-top: 1px solid var(--border-subtle);
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .nav-links > li {
        width: 100%;
    }

    .nav-links > li > a,
    .dropdown-btn {
        display: flex;
        justify-content: center;
        width: 100%;
        padding: 1rem;
        font-size: 1rem;
    }

    .mobile-menu-btn {
        display: flex;
    }

    /* Mobile dropdown */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(0, 0, 0, 0.3);
        margin-top: 0.5rem;
        border-radius: 8px;
        display: none;
        border: none;
    }

    .nav-dropdown.mobile-open .dropdown-menu {
        display: block;
    }

    .dropdown-menu a {
        padding: 0.875rem 1.5rem;
        text-align: center;
    }

    .dropdown-menu a:hover {
        padding-left: 1.5rem;
    }

    /* Mobile language dropdown */
    .lang-dropdown {
        width: 100%;
        margin: 0;
    }

    .lang-btn {
        width: 100%;
        justify-content: center;
    }

    .lang-options {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(0, 0, 0, 0.3);
        margin-top: 0.5rem;
        border-radius: 8px;
        display: none;
        border: none;
    }

    .lang-dropdown.mobile-open .lang-options {
        display: block;
    }

    .lang-options a {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    nav {
        padding: 0 1rem;
    }

    .logo {
        font-size: 1.25rem;
    }

    .logo img {
        height: 38px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.1rem;
    }

    .logo img {
        height: 32px;
    }
}