/* ============================================================================
   IBM PC/XT & x86 Web Emulator Suite Styling
   ============================================================================ */

:root {
    --bg-dark: #0a0e14;
    --bg-panel: #131920;
    --bg-panel-header: #1b232c;
    --border-color: #273444;
    --border-focus: #00ff9d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #536374;
    --accent-cyan: #00e5ff;
    --accent-green: #00ff9d;
    --accent-amber: #ffb86c;
    --accent-red: #ff5555;
    --font-mono: 'Fira Code', 'Cascadia Code', 'Source Code Pro', 'Consolas', monospace;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
}

/* App Header */
.app-header {
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-badge {
    background: linear-gradient(135deg, #0077b6, #00b4d8);
    color: #fff;
    font-weight: 800;
    font-size: 12px;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
    letter-spacing: 1px;
}

.app-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
    background: linear-gradient(90deg, #ffffff, #90e0ef);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 14px;
}

/* Main Layout */
.main-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* IBM PC Case & Monitor Frame */
.pc-desktop-case {
    background: #141b24;
    border: 2px solid #28374a;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

/* CRT Screen Frame */
.crt-monitor-frame {
    background: #0d1218;
    border: 14px solid #1c2633;
    border-radius: 16px;
    padding: 10px;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.9), 0 8px 24px rgba(0, 0, 0, 0.6);
    position: relative;
    max-width: 100%;
}

.cga-canvas {
    display: block;
    width: 640px;
    height: 400px;
    background: #000;
    border-radius: 4px;
    max-width: 100%;
    image-rendering: pixelated;
    outline: none;
    cursor: text;
}

.cga-canvas:focus {
    box-shadow: 0 0 14px rgba(0, 229, 255, 0.45);
}

.crt-scanlines {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%);
    background-size: 100% 4px;
    pointer-events: none;
    border-radius: 4px;
}

/* Monitor Badging & Mode Switchers */
.monitor-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 640px;
    font-family: var(--font-mono);
    font-size: 12px;
}

.ibm-badge {
    color: #38bdf8;
    font-weight: 800;
    letter-spacing: 1px;
}

.filter-buttons {
    display: flex;
    gap: 6px;
}

.btn-filter {
    background: #182230;
    border: 1px solid #2b3b50;
    color: #94a3b8;
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 11px;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all 0.15s;
}

.btn-filter.active {
    background: #0284c7;
    border-color: #38bdf8;
    color: #ffffff;
}

/* Storage & Drives Bay */
.storage-bay {
    width: 100%;
    max-width: 800px;
    background: #0e151e;
    border: 1px solid #222f40;
    border-radius: 8px;
    padding: 12px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.drive-unit {
    display: flex;
    align-items: center;
    gap: 10px;
}

.drive-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    color: #cbd5e1;
}

.led {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transition: all 0.15s;
}

.led-off {
    background: #2b394a;
}

.led-active-red {
    background: #ff3333;
    box-shadow: 0 0 10px #ff3333;
}

.led-active-amber {
    background: #ffb86c;
    box-shadow: 0 0 10px #ffb86c;
}

.led-active-green {
    background: #00ff9d;
    box-shadow: 0 0 10px #00ff9d;
}

/* Control Buttons & Sliders */
.btn-retro {
    background: #1b2636;
    color: #e2e8f0;
    border: 1px solid #2e415b;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    padding: 6px 14px;
    cursor: pointer;
    transition: all 0.15s;
    user-select: none;
}

.btn-retro:hover {
    background: #283952;
    border-color: #38bdf8;
    color: #38bdf8;
}

.btn-run {
    background: rgba(0, 255, 157, 0.15);
    color: #00ff9d;
    border-color: #00ff9d;
}

.btn-danger {
    background: rgba(255, 85, 85, 0.15);
    color: #ff5555;
    border-color: #ff5555;
}

.status-pill {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 12px;
    background: rgba(0, 255, 157, 0.15);
    color: #00ff9d;
    border: 1px solid #00ff9d;
}

/* Drop Zone */
.drop-zone {
    width: 100%;
    max-width: 800px;
    border: 2px dashed #2b3b50;
    background: rgba(15, 23, 35, 0.5);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.drop-zone:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(0, 229, 255, 0.05);
}

.drop-zone input[type="file"] {
    display: none;
}

/* Assembler & Debugger Grid */
.dev-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 20px;
}

@media (max-width: 900px) {
    .dev-grid {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.panel-header {
    background: var(--bg-panel-header);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-title {
    font-size: 13px;
    font-weight: 700;
    font-family: var(--font-mono);
    color: #38bdf8;
}

.editor-wrap {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.code-textarea {
    width: 100%;
    height: 280px;
    background: #090e15;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #a5f3fc;
    font-family: var(--font-mono);
    font-size: 13px;
    padding: 12px;
    resize: vertical;
    outline: none;
    line-height: 1.4;
}

.code-textarea:focus {
    border-color: var(--border-focus);
}

/* Registers View */
.reg-grid {
    padding: 14px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.reg-box {
    background: #0b1118;
    border: 1px solid #1e2a3a;
    border-radius: 4px;
    padding: 6px 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
}

.reg-name {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 700;
}

.reg-val {
    font-size: 13px;
    color: var(--accent-amber);
    font-weight: 700;
}