/* =============================================================================
   EKTTECH 3D LAB — Endüstriyel B2B UI Stylesheet
   ============================================================================= */

:root {
    /* Kurumsal Renk Paleti (Antrasit / Grafit) */
    --bg-dark: #111827;
    --bg-surface: rgba(31, 41, 55, 0.95);
    --bg-surface-solid: #1F2937;
    --bg-panel: #171E2B;
    
    --clr-primary: #3B82F6;
    --clr-primary-hover: #2563EB;
    --clr-accent: #0EA5E9;
    --clr-gold: #F59E0B;
    --clr-success: #10B981;
    --clr-text: #F9FAFB;
    --clr-text-muted: #9CA3AF;
    --clr-border: rgba(255, 255, 255, 0.08);
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --sidebar-w: 360px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-dark);
    color: var(--clr-text);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    user-select: none;
    -webkit-user-select: none;
}

/* =============================================================================
   1. YÜKLEME EKRANI (KURUMSAL)
   ============================================================================= */
.loading-screen {
    position: fixed;
    inset: 0;
    z-index: 99999;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    max-width: 400px;
}

.loading-logo {
    margin-bottom: 1.5rem;
}

.loading-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: #FFFFFF;
    margin-bottom: 0.5rem;
}

.loading-status {
    font-size: 0.875rem;
    color: var(--clr-text-muted);
    margin-bottom: 2rem;
}

.loading-bar-wrap {
    width: 240px;
    height: 3px;
    background: rgba(255, 255, 255, 0.1);
    margin: 0 auto;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.loading-bar {
    width: 0%;
    height: 100%;
    background: var(--clr-primary);
    transition: width 0.2s ease;
}

/* =============================================================================
   2. ANA LAYOUT (Masaüstü Yan Panel)
   ============================================================================= */
.app-layout {
    display: flex;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* =============================================================================
   3. SOL PANEL: 3D SAHNE
   ============================================================================= */
.canvas-pane {
    flex: 1;
    position: relative;
    background: var(--bg-dark);
    overflow: hidden;
}

.btn-back-main {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 50;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: var(--bg-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    color: var(--clr-text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
}

.btn-back-main:hover {
    color: #FFFFFF;
    background: var(--bg-surface-solid);
    border-color: rgba(255, 255, 255, 0.2);
}

.canvas-container {
    width: 100%;
    height: 100%;
    cursor: grab;
}

.canvas-container:active {
    cursor: grabbing;
}

/* =============================================================================
   4. SAĞ PANEL: BİLGİ VE KONTROL (SIDEBAR)
   ============================================================================= */
.sidebar-pane {
    width: var(--sidebar-w);
    flex-shrink: 0;
    background: var(--bg-panel);
    border-left: 1px solid var(--clr-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    box-shadow: -10px 0 30px rgba(0,0,0,0.2);
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid var(--clr-border);
}

.brand-badge {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--clr-text-muted);
    letter-spacing: 0.08em;
    margin-bottom: 0.25rem;
}

.brand-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.125rem;
    font-weight: 600;
    color: #FFFFFF;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--clr-text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #FFFFFF;
    border-color: var(--clr-border);
}

/* İlerleme Çubuğu */
.progress-track {
    width: 100%;
    height: 2px;
    background: rgba(0, 0, 0, 0.2);
}

.progress-fill {
    height: 100%;
    width: 8.33%;
    background: var(--clr-primary);
    transition: width 0.4s ease;
}

/* Aşama İçeriği */
.step-content {
    flex: 1;
    padding: 2rem 1.5rem;
    overflow-y: auto;
}

.step-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.step-num {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--bg-dark);
    background: var(--clr-gold);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.step-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--clr-primary);
}

.step-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: #FFFFFF;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.step-desc {
    font-size: 0.875rem;
    color: var(--clr-text-muted);
    line-height: 1.6;
}

/* Aşama Kontrolleri */
.step-controls {
    padding: 1.5rem;
    border-top: 1px solid var(--clr-border);
    display: flex;
    gap: 0.75rem;
    background: var(--bg-surface-solid);
}

.btn-nav, .btn-play-pause {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 42px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm);
    color: var(--clr-text);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-nav:hover, .btn-play-pause:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-nav {
    width: 42px; /* Geri butonu ikon boyutunda */
}

.btn-play-pause {
    flex: 1;
    gap: 0.5rem;
}

.btn-nav.primary {
    width: auto;
    flex: 1;
    background: var(--clr-primary);
    border-color: var(--clr-primary);
    gap: 0.5rem;
}

.btn-nav.primary:hover {
    background: var(--clr-primary-hover);
}

/* =============================================================================
   5. AŞAMA MENÜSÜ (DRAWER)
   ============================================================================= */
.drawer-modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.drawer-modal.open {
    opacity: 1;
    visibility: visible;
}

.drawer-content {
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    background: var(--bg-panel);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
}

.drawer-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--clr-border);
}

.drawer-header h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.125rem;
    font-weight: 600;
}

.drawer-grid {
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.drawer-item-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm);
    color: var(--clr-text-muted);
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
}

.drawer-item-btn:hover, .drawer-item-btn.active {
    background: rgba(255, 255, 255, 0.05);
    color: #FFFFFF;
    border-color: rgba(255, 255, 255, 0.2);
}

.drawer-item-num {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--clr-text-muted);
    width: 24px;
}

.drawer-item-btn.active .drawer-item-num {
    color: var(--clr-primary);
}

/* =============================================================================
   6. MOBİL RESPONSIVE (ALT ÇEKMECE YAKLAŞIMI)
   ============================================================================= */
@media (max-width: 850px) {
    .app-layout {
        flex-direction: column;
    }
    
    .canvas-pane {
        flex: 1;
        height: 60vh;
    }
    
    .sidebar-pane {
        width: 100%;
        height: 40vh; /* Alt yarım ekran */
        border-left: none;
        border-top: 1px solid var(--clr-border);
        box-shadow: 0 -10px 20px rgba(0,0,0,0.3);
    }
    
    .sidebar-header {
        padding: 1rem;
    }
    
    .step-content {
        padding: 1rem;
    }
    
    .step-title {
        font-size: 1.125rem;
        margin-bottom: 0.5rem;
    }
    
    .step-desc {
        font-size: 0.8125rem;
    }
    
    .step-controls {
        padding: 1rem;
    }
    
    .btn-back-main {
        top: 1rem;
        left: 1rem;
    }
    
    .btn-back-main span {
        display: none;
    }
}

.hidden {
    display: none !important;
}