/* ========== 两阶段法样式 ========== */
/* 复用单纯形法基础样式 */

/* 变量定义 - 暖色系 */
:root {
    --primary-color: #D84315;
    --secondary-color: #FF8F00;
    --accent-color: #FF6F00;
    --bg-color: #FFFAF0;
    --text-color: #4E342E;
    --highlight-bg: #FFF3E0;
    --border-color: #FFE0B2;
    --header-bg: #FFF3E0;
    --white: #FFFFFF;
    --phase1-color: #FF8F00;
    --phase2-color: #D84315;
}

body {
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.5;
    font-size: 16px;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 20px;
}

.header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.header h1 {
    color: var(--primary-color);
    font-size: 2.2em;
    margin: 0 0 8px 0;
}

.header .subtitle {
    color: #8d6e63;
    font-size: 1.1em;
    margin: 0;
}

.back-btn {
    display: inline-block;
    margin-bottom: 20px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #ffb300, #ff8f00);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.back-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(255, 140, 0, 0.3);
}

.navigation {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.nav-btn {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.nav-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

.main-layout {
    display: grid;
    grid-template-columns: 400px minmax(0, 1fr);
    gap: 25px;
    align-items: stretch;
}

.left-column {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
}

.input-panel {
    background: var(--white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-top: 5px solid var(--primary-color);
    display: flex;
    flex-direction: column;
}

.panel-section {
    margin-bottom: 18px;
}

.panel-section h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-size: 1.1em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}

.hint-text {
    font-size: 0.8em;
    color: rgba(78, 52, 46, 0.6);
    margin-top: -10px;
    margin-bottom: 10px;
    font-style: italic;
}

.input-inline {
    display: flex;
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex: 1;
}

.input-group label {
    font-size: 0.95em;
    font-weight: bold;
}

.input-group input, .input-group select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    outline: none;
    background: white;
}

.input-group input:focus, .input-group select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(255, 143, 0, 0.1);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

#coeff-table-container {
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
}

.input-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95em;
}

.input-table th, .input-table td {
    padding: 4px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.input-table th {
    background-color: var(--highlight-bg);
}

.input-table input {
    width: 50px;
    padding: 4px;
    border: none;
    text-align: center;
    outline: none;
    background: transparent;
}

.input-table input:focus {
    background-color: #fff9c4;
}

.panel-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 14px;
}

.panel-actions #solve-btn {
    grid-column: span 2;
    margin-top: 5px;
}

.action-btn {
    padding: 10px;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
}

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

.action-btn.primary:hover {
    background-color: #BF360C;
    box-shadow: 0 4px 8px rgba(216, 67, 21, 0.3);
}

.action-btn.secondary {
    background-color: var(--highlight-bg);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.action-btn.secondary:hover {
    background-color: var(--border-color);
}

.result-area {
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: 20px;
    min-height: 0;
    overflow: hidden;
}

.experiment-data-panel {
    background: var(--white);
    border-radius: 15px;
    padding: 18px 20px;
    border-top: 5px solid var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.experiment-data-header h3 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.02em;
}

.experiment-data-header p {
    margin: 6px 0 0;
    color: #8d6e63;
    font-size: 0.85em;
}

.experiment-data-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 14px;
}

.experiment-data-actions .action-btn {
    width: 100%;
}

.results-container {
    box-sizing: border-box;
    background: var(--white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    min-height: 0;
    flex: 1;
    overflow-y: auto;
}

.placeholder-text {
    width: 100%;
    min-height: 100%;
    height: 100%;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 24px;
    color: #9E9E9E;
    font-style: italic;
    border: 2px dashed #f3d5b3;
    border-radius: 12px;
    background: linear-gradient(145deg, #fffdf9, #fff7eb);
}

/* ========== 阶段面板特有样式 ========== */

.phase-panel {
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.phase-panel[open] {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.phase-panel[disabled] {
    opacity: 0.5;
    pointer-events: none;
}

.phase-panel[disabled] .phase-header {
    cursor: not-allowed;
    background: #f5f5f5;
}

.phase-panel.hidden {
    display: none;
}

.phase-header {
    padding: 18px 24px;
    background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    list-style: none;
}

.phase-header::-webkit-details-marker {
    display: none;
}

.phase-title-group h3 {
    margin: 0 0 6px 0;
    color: var(--primary-color);
    font-size: 1.2em;
}

.phase-subtitle {
    font-size: 0.85em;
    color: #8D6E63;
    font-weight: 500;
}

.phase-status-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    min-width: 80px;
    text-align: center;
    transition: all 0.3s ease;
}

.phase-status-badge.pending {
    background: #F5F5F5;
    color: #757575;
}

.phase-status-badge.running {
    background: #FFF3E0;
    color: #E65100;
    animation: pulse 1.5s infinite;
}

.phase-status-badge.success {
    background: #E8F5E9;
    color: #2E7D32;
}

.phase-status-badge.infeasible {
    background: #FFEBEE;
    color: #C62828;
}

.phase-status-badge.unbounded {
    background: #F3E5F5;
    color: #7B1FA2;
}

.phase-status-badge.cycle {
    background: #FFF3E0;
    color: #E65100;
    border: 1px solid #FFB74D;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.phase-content {
    padding: 20px 24px;
    background: white;
}

.phase-info-card {
    background: linear-gradient(135deg, #FAFAFA 0%, #F5F5F5 100%);
    border-left: 4px solid var(--secondary-color);
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95em;
    color: #5D4037;
}

.phase-info-card p {
    margin: 0 0 10px 0;
}

.phase-info-card ul {
    margin: 0;
    padding-left: 20px;
}

.phase-info-card li {
    margin: 6px 0;
}

.phase-cards-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.iteration-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    background-color: white;
    transition: transform 0.2s, box-shadow 0.2s;
}

.iteration-card:hover {
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.08);
}

.iteration-card h4 {
    margin-top: 0;
    color: var(--primary-color);
    border-left: 4px solid var(--secondary-color);
    padding-left: 10px;
    margin-bottom: 15px;
}

.iteration-card.phase-1 {
    border-left: 4px solid var(--phase1-color);
}

.iteration-card.phase-2 {
    border-left: 4px solid var(--phase2-color);
}

.iteration-card.phase-1 h4 {
    border-left-color: var(--phase1-color);
}

.iteration-card.phase-2 h4 {
    border-left-color: var(--phase2-color);
}

.table-wrapper {
    overflow-x: auto;
    margin-bottom: 15px;
    padding-bottom: 10px;
}

.explanation {
    font-size: 0.95em;
    color: #5D4037;
    background: var(--highlight-bg);
    padding: 12px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.alert {
    padding: 10px;
    border-radius: 6px;
    margin-top: 10px;
    font-weight: bold;
}

.alert-warning {
    background-color: #FFFDE7;
    color: #F57F17;
    border: 1px solid #FFF9C4;
}

.alert-danger {
    background-color: #FFEBEE;
    color: #C62828;
    border: 1px solid #FFCDD2;
}

.alert-success {
    background-color: #E8F5E9;
    color: #2E7D32;
    border: 1px solid #C8E6C9;
}

.phase-conclusion {
    margin-top: 20px;
}

.phase-conclusion.hidden {
    display: none;
}

.simplex-svg text {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 12px;
}

.constraint-limit-warning {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #ff4444;
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 10000;
    animation: fadeOut 3s forwards;
    animation-delay: 2s;
}

@keyframes fadeOut {
    0% {
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        visibility: hidden;
    }
}

footer {
    text-align: center;
    padding: 40px 20px;
    color: #a1887f;
    font-size: 14px;
}

@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .results-container {
        height: auto;
        min-height: 400px;
    }
}

@media (max-width: 880px) {
    .experiment-data-actions {
        grid-template-columns: 1fr;
    }
}