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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #6b7280;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --border-color: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    background-image: url('assets/background.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: 1.5rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border-bottom: 1px solid rgba(51, 65, 85, 0.3);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
}

.container {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 1.5rem;
}

.editor-section {
    grid-column: 1 / 2;
    grid-row: 1 / 3;
    display: flex;
    flex-direction: column;
}

.output-section {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
}

.stdin-section {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
}

.editor-header,
.output-header,
.stdin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(51, 65, 85, 0.35);
    border-radius: 8px 8px 0 0;
    font-weight: 500;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-primary:disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
}

.btn-secondary {
    background-color: rgba(30, 41, 59, 0.5);
    color: var(--text-primary);
    border: 1px solid rgba(51, 65, 85, 0.4);
}

.btn-secondary:hover {
    background-color: rgba(51, 65, 85, 0.5);
}

/* CodeMirror 编辑器 */
.CodeMirror {
    flex: 1;
    min-height: 500px;
    border: 1px solid rgba(51, 65, 85, 0.35);
    border-radius: 0 0 8px 8px;
    font-size: 14px;
    line-height: 1.6;
    background: rgba(15, 23, 42, 0.65);
}

.CodeMirror:focus-within {
    border-color: var(--primary-color);
}

/* 输出区域 */
.output-content {
    flex: 1;
    min-height: 250px;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(51, 65, 85, 0.35);
    border-radius: 0 0 8px 8px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 14px;
    line-height: 1.6;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

/* 标准输入区域 */
#stdinInput {
    width: 100%;
    min-height: 120px;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(51, 65, 85, 0.35);
    border-radius: 0 0 8px 8px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 14px;
    resize: vertical;
}

#stdinInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 状态徽章 */
.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-badge.hidden {
    display: none;
}

.status-badge.success {
    background-color: rgba(34, 197, 94, 0.3);
    color: var(--success-color);
}

.status-badge.error {
    background-color: rgba(239, 68, 68, 0.3);
    color: var(--error-color);
}

.status-badge.running {
    background-color: rgba(245, 158, 11, 0.3);
    color: var(--warning-color);
}

/* 后端状态指示器 */
.backend-status {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    display: inline-block;
}
.backend-status.healthy {
    color: var(--success-color);
    background: rgba(34, 197, 94, 0.15);
}
.backend-status.error {
    color: var(--error-color);
    background: rgba(239, 68, 68, 0.15);
}


/* 页脚 */
footer {
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid rgba(51, 65, 85, 0.3);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-highlight {
    color: #60a5fa;
    font-weight: bold;
    font-size: 1rem;
    text-shadow: 0 0 5px rgba(96, 165, 250, 0.3);
}

.mobile-hint {
    display: none;
    width: 100%;
    padding: 0.5rem 1rem;
    background: rgba(245, 158, 11, 0.16);
    color: var(--text-primary);
    text-align: center;
    font-size: 0.85rem;
}

/* 手机端单列布局 */
@media (max-width: 768px) {
    .mobile-hint {
        display: block;
    }
    header h1 {
        font-size: 1.3rem;
    }
    header p {
        font-size: 0.75rem;
    }
    header {
        padding: 0.5rem;
    }
    .container {
        grid-template-columns: 1fr;
        padding: 0.5rem;
        gap: 0.5rem;
    }
    .editor-section,
    .output-section,
    .stdin-section {
        grid-column: 1;
        grid-row: auto;
    }
    .CodeMirror {
        min-height: 260px;
        font-size: 13px;
    }
    .output-content {
        min-height: 120px;
        font-size: 12px;
    }
    #stdinInput {
        min-height: 50px;
        font-size: 12px;
    }
    .btn {
        padding: 0.35rem 0.7rem;
        font-size: 0.75rem;
    }
    .editor-header,
    .output-header,
    .stdin-header {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }
    footer {
        padding: 0.75rem;
        font-size: 0.75rem;
    }
    .footer-highlight {
        font-size: 0.85rem;
    }
}

/* 平板横屏双列 */
@media (min-width: 769px) and (max-width: 1024px) and (orientation: landscape) {
    .container {
        grid-template-columns: 1fr 1fr;
        padding: 1rem;
        gap: 1rem;
    }
}

.editor-options { display: flex; flex-wrap: wrap; gap: 1rem; padding: .75rem 1rem; background: rgba(15,23,42,.6); }
.editor-options label { display: flex; align-items: center; gap: .5rem; font-size: .85rem; }
select { max-width: 100%; color: var(--text-primary); background: #1e293b; border: 1px solid var(--border-color); border-radius: 5px; padding: .4rem; }
.editor-note { padding: .5rem .75rem; font-size: .75rem; color: var(--text-secondary); line-height: 1.6; background: rgba(15,23,42,.7); }
#codeEditor { display: block; width: 100%; min-height: 400px; resize: vertical; padding: 1rem; background: rgba(15,23,42,.85); color: var(--text-primary); font: 14px/1.6 monospace; border: 1px solid var(--border-color); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.container { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.editor-section, .output-section, .stdin-section { min-width: 0; }
.btn:focus-visible, select:focus-visible { outline: 2px solid #60a5fa; outline-offset: 2px; }
@media (max-width: 768px) {
    .container { grid-template-columns: minmax(0, 1fr); }
    .editor-header { flex-wrap: wrap; gap: .5rem; }
    .actions { flex-wrap: wrap; }
    .editor-options { padding: .5rem; gap: .5rem; }
    #codeEditor { min-height: 260px; }
}

.project-links { display: flex; justify-content: center; flex-wrap: wrap; gap: .5rem; margin-top: .75rem; }
.project-links a { text-decoration: none; }