/* ==========================================================================
   Nova Studio - Compact Minimalist Monochrome System
   With High-Contrast AAA Text, Native Theme Switcher & Grayscale Image Hover
   ========================================================================== */

:root, [data-theme="dark"] {
    --bg-main: #000000;
    --bg-surface: #09090b;
    --bg-card: #121215;
    --bg-card-hover: #1c1c21;
    
    --border-main: #27272a;
    --border-contrast: #ffffff;
    
    --text-heading: #ffffff;
    --text-body: #e4e4e7;
    --text-muted: #d4d4d8; /* High-contrast legible muted text */
    --text-dim: #a1a1aa;
    
    --btn-bg: #ffffff;
    --btn-text: #000000;
    --btn-border: #ffffff;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme="light"] {
    --bg-main: #f4f4f5;
    --bg-surface: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    
    --border-main: #e4e4e7;
    --border-contrast: #000000;
    
    --text-heading: #000000;
    --text-body: #18181b;
    --text-muted: #3f3f46;
    --text-dim: #71717a;
    
    --btn-bg: #000000;
    --btn-text: #ffffff;
    --btn-border: #000000;
}

/* Custom Text Selection Highlight (Gece: Beyaz Arka Plan / Siyah Metin | Gündüz: Siyah Arka Plan / Beyaz Metin) */
::selection {
    background-color: var(--border-contrast) !important;
    color: var(--bg-main) !important;
}

::-moz-selection {
    background-color: var(--border-contrast) !important;
    color: var(--bg-main) !important;
}

* {
    border-radius: 0 !important; /* Zero rounded corners directive */
}

body {
    background-color: var(--bg-main);
    color: var(--text-body);
    font-family: var(--font-sans);
    line-height: 1.55;
    overflow-x: hidden;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* --- Accessibility Focus Rings --- */
:focus-visible {
    outline: 2px solid var(--border-contrast) !important;
    outline-offset: 3px !important;
}

/* --- Header --- */
.header-mono {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-main);
}

.brand-square {
    width: 36px;
    height: 36px;
    background: var(--btn-bg);
    color: var(--btn-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
}

.brand-title {
    font-weight: 900;
    color: var(--text-heading);
    font-size: 1.05rem;
    letter-spacing: 0.05em;
    line-height: 1;
}

.brand-sub {
    font-size: 0.6rem;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    font-weight: 700;
}

.navbar-nav .nav-link {
    color: var(--text-muted);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    padding: 0.4rem 0.8rem !important;
    transition: all 0.15s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--text-heading);
    background: rgba(127, 127, 127, 0.15);
}

/* --- Theme Toggle Button --- */
.theme-toggle-btn {
    background: var(--bg-card);
    color: var(--text-heading);
    border: 1px solid var(--border-main);
    padding: 0.4rem 0.8rem;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.theme-toggle-btn:hover {
    background: var(--btn-bg);
    color: var(--btn-text);
}

/* --- Compact Buttons --- */
.btn-mono-solid {
    background: var(--btn-bg);
    color: var(--btn-text) !important;
    border: 1px solid var(--btn-border);
    font-weight: 800;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    padding: 0.5rem 1.25rem;
    transition: all 0.2s ease;
}

.btn-mono-solid:hover {
    background: var(--bg-main);
    color: var(--text-heading) !important;
    border-color: var(--border-contrast);
}

.btn-mono-outline {
    background: transparent;
    color: var(--text-heading) !important;
    border: 1px solid var(--border-main);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    padding: 0.5rem 1.25rem;
    transition: all 0.2s ease;
}

.btn-mono-outline:hover {
    background: var(--btn-bg);
    color: var(--btn-text) !important;
    border-color: var(--btn-border);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    color: var(--text-heading);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.text-white, .text-heading { color: var(--text-heading) !important; }
.text-muted { color: var(--text-muted) !important; }

/* --- Sharp Cards --- */
.card-mono {
    background: var(--bg-card);
    border: 1px solid var(--border-main);
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.card-mono:hover {
    border-color: var(--border-contrast);
    background: var(--bg-card-hover);
}

.icon-box-mono {
    width: 44px;
    height: 44px;
    background: var(--bg-main);
    border: 1px solid var(--border-main);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-heading);
    font-size: 1.2rem;
}

.card-mono:hover .icon-box-mono {
    background: var(--btn-bg);
    color: var(--btn-text);
}

/* --- Hero --- */
.hero-mono {
    padding-top: 4.5rem;
    padding-bottom: 3.5rem;
    border-bottom: 1px solid var(--border-main);
}

.badge-mono {
    background: var(--bg-card);
    color: var(--text-heading);
    border: 1px solid var(--border-main);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    padding: 0.4rem 0.8rem;
    display: inline-block;
}

.code-box-mono {
    background: var(--bg-surface);
    border: 1px solid var(--border-main);
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--text-body);
}

/* --- Interactive Grayscale to Full Color Image Hover Effect --- */
.portfolio-mono-img {
    height: 220px;
    overflow: hidden;
    border-bottom: 1px solid var(--border-main);
    position: relative;
    background: #000;
}

.portfolio-mono-img img,
.portfolio-main-img img,
.card-mono img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%) opacity(0.85); /* Default state: Grayscale */
    transition: filter 0.4s ease-in-out, transform 0.4s ease-in-out, opacity 0.4s ease-in-out;
}

/* Hover state: Reveal full original color & subtle zoom */
.card-mono:hover .portfolio-mono-img img,
.portfolio-mono-img:hover img,
.portfolio-main-img img:hover,
.card-mono:hover img {
    filter: grayscale(0%) opacity(1); /* Full Original Color */
    transform: scale(1.05);
}

.btn-filter-mono {
    background: var(--bg-card);
    color: var(--text-muted);
    border: 1px solid var(--border-main);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.4rem 1rem;
    transition: all 0.2s ease;
}

.btn-filter-mono:hover,
.btn-filter-mono.active {
    background: var(--btn-bg);
    color: var(--btn-text);
    border-color: var(--btn-border);
}

/* --- Forms --- */
.form-control, .form-select {
    background-color: var(--bg-card) !important;
    color: var(--text-heading) !important;
    border: 1px solid var(--border-main) !important;
    padding: 0.65rem 1rem;
    font-size: 0.9rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--border-contrast) !important;
    box-shadow: none !important;
}

/* --- Footer --- */
.footer-mono {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-main);
    padding-top: 3rem;
    padding-bottom: 2rem;
}

/* --- Reveal --- */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* --- Mobile Responsive Rules --- */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background: var(--bg-surface);
        border: 1px solid var(--border-main);
        padding: 1rem;
        margin-top: 0.5rem;
    }
}

@media (max-width: 767.98px) {
    .hero-mono {
        padding-top: 2.5rem;
        padding-bottom: 2rem;
    }
    .display-3 {
        font-size: 2.25rem !important;
    }
    .display-4 {
        font-size: 2rem !important;
    }
    .display-6 {
        font-size: 1.5rem !important;
    }
    .portfolio-mono-img {
        height: 180px;
    }
}