/* ========================================================================
   DSRL CORE STYLES (v2.0)
   Theme: Research Lab / Dark Mode / IDE
   ======================================================================== */

:root {
    /* Color Palette - Dark Dimmed Theme */
    --bg-body: #0d1117;       /* Very dark grey (almost black) */
    --bg-card: #161b22;       /* Panel background */
    --bg-input: #010409;      /* Input background */
    --bg-hover: #21262d;      /* Hover state */
    
    --border-color: #30363d;  /* Subtle borders */
    --border-active: #8b949e; /* Active border */
    
    --text-primary: #c9d1d9;  /* Main text */
    --text-secondary: #8b949e;/* Muted text */
    --text-code: #e6edf3;     /* Code blocks */

    /* Accents */
    --accent-blue: #58a6ff;   /* Links, Primary Actions */
    --accent-green: #238636;  /* Success, Status OK */
    --accent-red: #da3633;    /* Errors, Danger */
    --accent-orange: #d29922; /* Warnings */
    
    /* Spacing & Layout */
    --header-height: 64px;
    --radius-sm: 4px;
    --radius-md: 8px;
    
    /* Fonts */
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 16px;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { text-decoration: none; color: var(--accent-blue); transition: opacity 0.2s; }
a:hover { opacity: 0.8; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* --- UTILITIES --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.mono { font-family: var(--font-mono); }
.text-center { text-align: center; }
.hidden { display: none !important; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    font-family: var(--font-ui);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary { background-color: var(--accent-blue); color: #0d1117; }
.btn-primary:hover { background-color: #79c0ff; }

.btn-ghost { background-color: transparent; border-color: var(--border-color); color: var(--text-primary); }
.btn-ghost:hover { border-color: var(--text-secondary); background-color: var(--bg-hover); }

.btn-danger { background-color: rgba(218, 54, 51, 0.1); color: var(--accent-red); border-color: rgba(218, 54, 51, 0.3); }
.btn-danger:hover { background-color: rgba(218, 54, 51, 0.2); }

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.full-width { width: 100%; }

/* Inputs */
input, select, textarea {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
}

/* Badges & Tags */
.badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
}
.badge-int { background: rgba(88, 166, 255, 0.15); color: var(--accent-blue); border: 1px solid rgba(88, 166, 255, 0.3); }

/* --- HEADER & NAVIGATION --- */
.main-header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}
.logo-icon { color: var(--accent-green); font-size: 1.4rem; }

/* Desktop Nav (Default Hidden on Mobile) */
.nav-links {
    display: none; /* Hidden on mobile */
    gap: 24px;
}

.nav-item {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
}
.nav-item:hover, .nav-item.active { color: var(--text-primary); }
.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -22px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-orange);
}

/* Hamburger (Visible on Mobile) */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: 0.3s;
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-body);
    padding: 20px;
    display: none; /* JS toggles this */
    flex-direction: column;
    gap: 20px;
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
}
.mobile-menu.is-open { display: flex; }
.mobile-menu .nav-item { font-size: 1.2rem; padding: 10px 0; border-bottom: 1px solid var(--bg-hover); width: 100%; }
.mobile-menu .nav-item.active::after { display: none; } /* Remove underline for mobile */
.mobile-menu .nav-item.active { color: var(--accent-blue); }

/* --- PAGE LAYOUTS --- */
main { flex: 1; padding: 40px 0; }

.section-title {
    font-size: 1.8rem;
    margin-bottom: 10px;
    font-weight: 700;
    color: var(--text-primary);
}
.section-subtitle {
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
}

/* --- TOOLS GRID SYSTEM --- */
.tools-filter {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

.filter-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    white-space: nowrap;
}
.filter-btn:hover { color: var(--text-primary); background-color: var(--bg-hover); }
.filter-btn.active {
    color: var(--accent-blue);
    border-bottom: 2px solid var(--accent-blue);
    background-color: rgba(88, 166, 255, 0.05);
}

.tools-grid {
    display: grid;
    grid-template-columns: 1fr; /* Mobile: 1 col */
    gap: 24px;
}

.tool-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: transform 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
}

.tool-card:hover { border-color: var(--text-secondary); transform: translateY(-2px); }
.tool-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.tool-title { font-size: 1.1rem; font-weight: 600; color: var(--accent-blue); font-family: var(--font-mono); }
.tool-icon { font-size: 1.2rem; opacity: 0.7; }

/* Tool Outputs */
.result-box {
    margin-top: 15px;
    background-color: #000;
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-green);
    min-height: 48px;
    word-break: break-all;
    white-space: pre-wrap;
}
.result-box.error { color: var(--accent-red); }
.result-label { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; margin-top: 10px; display: block; }

/* Tool Inputs Group */
.input-group { display: flex; gap: 8px; }
.input-group input { flex: 1; }
.checkbox-wrap { display: flex; gap: 15px; margin-bottom: 10px; flex-wrap: wrap; }
.checkbox-wrap label { display: flex; align-items: center; gap: 6px; font-size: 0.9rem; cursor: pointer; }

/* --- DOCUMENTATION LAYOUT --- */
.docs-layout {
    display: grid;
    grid-template-columns: 1fr; /* Mobile: Stacked */
    gap: 30px;
}

.docs-sidebar {
    background-color: var(--bg-card);
    padding: 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    height: fit-content;
}

.doc-search { margin-bottom: 20px; }
.doc-cats { display: flex; flex-direction: column; gap: 5px; }
.doc-cat-btn {
    text-align: left;
    background: none;
    border: none;
    padding: 8px 12px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}
.doc-cat-btn:hover, .doc-cat-btn.active { background-color: var(--bg-hover); color: var(--accent-blue); }

.doc-article {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    margin-bottom: 24px;
}
.doc-meta { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 8px; text-transform: uppercase; }
.doc-article h2 { color: var(--text-primary); margin-bottom: 16px; border-bottom: 1px solid var(--border-color); padding-bottom: 8px; }
.doc-article p { margin-bottom: 16px; color: var(--text-primary); }

/* Syntax Highlighting Sim */
pre {
    background-color: var(--bg-body);
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    border: 1px solid var(--border-color);
    margin-bottom: 16px;
}
code { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-code); }
.cmd { color: var(--accent-orange); }
.arg { color: var(--accent-blue); }
.comment { color: var(--text-secondary); font-style: italic; }

/* --- LOGIN PAGE --- */
.login-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
}
.login-card {
    width: 100%;
    max-width: 400px;
    background-color: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.login-status {
    margin-top: 20px;
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: none;
    text-align: center;
}
.login-status.error {
    display: block;
    background-color: rgba(218, 54, 51, 0.1);
    color: var(--accent-red);
    border: 1px solid rgba(218, 54, 51, 0.2);
}
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- FOOTER --- */
.main-footer {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding: 30px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.footer-links { margin-top: 10px; display: flex; justify-content: center; gap: 20px; }

/* ========================================================================
   RESPONSIVE BREAKPOINTS (Desktop First fixes)
   ======================================================================== */

/* Tablet & Up */
@media (min-width: 768px) {
    .tools-grid { grid-template-columns: repeat(2, 1fr); }
    
    .login-wrap { min-height: 70vh; }
}

/* Desktop & Up */
@media (min-width: 1024px) {
    /* Header Fixes */
    .hamburger { display: none; }
    .nav-links { display: flex; }
    .mobile-menu { display: none !important; }

    /* Layout Fixes */
    .tools-grid { grid-template-columns: repeat(3, 1fr); }
    
    .docs-layout {
        grid-template-columns: 260px 1fr; /* Sidebar | Content */
        align-items: start;
    }
    .docs-sidebar { position: sticky; top: 80px; }
}

/* Wide Screens */
@media (min-width: 1400px) {
    .container { max-width: 1320px; }
}

/* --- WORKSPACE LAYOUT --- */
.workspace-body { overflow: hidden; height: 100vh; }

.tools-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    height: calc(100vh - var(--header-height));
}

/* SIDEBAR */
.tools-sidebar {
    background-color: var(--bg-card);
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    overflow-y: auto;
}

.sidebar-group { margin-bottom: 25px; }
.group-title {
    padding: 0 20px;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.sidebar-item {
    width: 100%;
    background: none;
    border: none;
    padding: 10px 20px;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}

.sidebar-item:hover { background-color: var(--bg-hover); }
.sidebar-item.active {
    background-color: rgba(88, 166, 255, 0.1);
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
}

/* VIEWPORT */
.tools-workspace {
    padding: 40px;
    overflow-y: auto;
    background-image: radial-gradient(circle at 50% 50%, #161b22 0%, #0d1117 100%);
}

.view-title { font-size: 1.5rem; margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
.workspace-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
}

.controls-row { display: flex; gap: 15px; margin: 20px 0; align-items: center; }
.split-view { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.pane textarea { width: 100%; font-family: var(--font-mono); }

.welcome-screen {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-align: center;
}

/* Адаптивность для сайдбара */
@media (max-width: 992px) {
    .tools-layout { grid-template-columns: 1fr; }
    .tools-sidebar { display: flex; overflow-x: auto; padding: 10px; height: auto; }
    .sidebar-group { display: flex; margin: 0; }
    .group-title { display: none; }
    .sidebar-item { white-space: nowrap; padding: 8px 15px; border-left: none; border-bottom: 2px solid transparent; }
    .sidebar-item.active { border-bottom-color: var(--accent-blue); }
}