@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&display=swap');

:root {
    --bg-color: #0B0F19;
    --card-bg: rgba(30, 41, 59, 0.4);
    --border-color: rgba(255, 255, 255, 0.06);
    --primary-blue: #3B82F6;
    --primary-cyan: #22D3EE;
    --accent-coral: #F87171;
    --text-main: #F3F4F6;
    --text-muted: #9CA3AF;
    --success: #10B981;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(34, 211, 238, 0.1) 0px, transparent 50%);
    color: var(--text-main);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.5rem;
}

@media (max-width: 1100px) {
    .container {
        grid-template-columns: 1fr;
    }
}

/* Glassmorphism Card Style */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Header */
header {
    grid-column: 1 / -1;
    margin-bottom: 1rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary-cyan), var(--primary-blue));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed rgba(34, 211, 238, 0.3);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
    background: rgba(15, 23, 42, 0.3);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary-cyan);
    background: rgba(34, 211, 238, 0.05);
    transform: translateY(-2px);
}

.drop-zone i {
    font-size: 2.5rem;
    color: var(--primary-cyan);
    margin-bottom: 0.8rem;
}

/* Form Groups */
.form-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-cyan);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.form-group label span {
    color: var(--primary-cyan);
    font-weight: 600;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary-cyan);
}

input[type="number"] {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.6rem;
    color: var(--text-main);
    font-size: 0.95rem;
}

.glass-select {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.6rem;
    color: var(--text-main);
    font-size: 0.95rem;
    cursor: pointer;
    outline: none;
}

.glass-select option {
    background: var(--bg-color);
    color: var(--text-main);
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.2rem;
    text-align: center;
}

.metric-card h4 {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-card p {
    font-size: 1.8rem;
    font-weight: 800;
    margin-top: 0.5rem;
    color: var(--primary-cyan);
}

/* Table Area */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.95rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: rgba(15, 23, 42, 0.5);
    color: var(--text-muted);
    font-weight: 600;
}

tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

#simulation-table tbody tr:hover {
    background: rgba(34, 211, 238, 0.15);
    transition: background 0.15s ease;
}

tr.selected-row {
    background: rgba(34, 211, 238, 0.1);
    border-left: 4px solid var(--primary-cyan);
}

.status-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-optimal {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

/* Chart Canvas Wrapper */
.chart-wrapper {
    height: 400px;
    margin-bottom: 1.5rem;
    position: relative;
}

/* Calculate Button */
.calc-btn {
    width: 100%;
    padding: 0.9rem;
    margin-top: 1rem;
    background: linear-gradient(to right, var(--primary-cyan), var(--primary-blue));
    color: #0B0F19;
    border: none;
    border-radius: 8px;
    font-weight: 800;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(34, 211, 238, 0.4);
    filter: brightness(1.1);
}

.calc-btn:active {
    transform: translateY(0px);
}

.calc-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(11, 15, 25, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.calc-msg {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-cyan);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Welcome State */
#welcome-state {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 1rem;
    min-height: 600px;
    justify-content: center;
}

.welcome-header {
    text-align: center;
}

.welcome-header h2 {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary-cyan), var(--primary-blue));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
}

.welcome-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.large-drop-zone {
    border: 3px dashed rgba(34, 211, 238, 0.4);
    border-radius: 20px;
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    background: rgba(15, 23, 42, 0.5);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    max-width: 700px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.large-drop-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(34, 211, 238, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.large-drop-zone:hover::before, .large-drop-zone.dragover::before {
    opacity: 1;
}

.large-drop-zone:hover, .large-drop-zone.dragover {
    border-color: var(--primary-cyan);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(34, 211, 238, 0.15);
}

.large-drop-zone i {
    font-size: 4rem;
    background: linear-gradient(45deg, var(--primary-cyan), var(--primary-blue));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(34, 211, 238, 0.3));
}

.large-drop-zone h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

.large-drop-zone p {
    color: var(--text-muted);
}

.welcome-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.welcome-info-grid .info-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.welcome-info-grid .info-card h4 {
    color: var(--primary-cyan);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.welcome-info-grid .info-card pre {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.05);
    font-family: monospace;
    font-size: 0.9rem;
    overflow-x: auto;
}

.welcome-info-grid .info-card code {
    font-family: 'Courier New', Courier, monospace;
    color: #E2E8F0;
}

.welcome-info-grid .info-card .muted-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.welcome-footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}