/* ==========================================================================
   부력과 아르키메데스 원리 시뮬레이션 CSS Design System
   ========================================================================== */

:root {
    /* Color Palette */
    --bg-main: #0B0F19;
    --bg-card: rgba(22, 30, 49, 0.75);
    --bg-card-hover: rgba(30, 41, 67, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-accent: rgba(56, 189, 248, 0.3);

    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --accent-blue: #38BDF8;
    --accent-blue-glow: rgba(56, 189, 248, 0.25);
    --accent-cyan: #06B6D4;
    --accent-green: #10B981;
    --accent-red: #EF4444;
    --accent-gold: #F59E0B;
    --accent-purple: #A855F7;

    /* Fonts */
    --font-family-base: 'Inter', 'Noto Sans KR', sans-serif;
    --font-family-title: 'Outfit', 'Noto Sans KR', sans-serif;
    --font-family-mono: 'JetBrains Mono', monospace;

    /* Shadows & Transitions */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    --glow-blue: 0 0 20px rgba(56, 189, 248, 0.3);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Global Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(16, 185, 129, 0.08) 0%, transparent 40%);
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1920px;
    margin: 0 auto;
}

/* ==========================================================================
   Header Architecture
   ========================================================================== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    gap: 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.title-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.title-container h1 {
    font-family: var(--font-family-title);
    font-size: 1.25rem;
    font-weight: 800;
    background: linear-gradient(135deg, #F8FAFC 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.pulse-dot {
    width: 10px;
    height: 10px;
    background-color: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-blue);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(56, 189, 248, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(255, 255, 255, 0.04);
    padding: 0.3rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-family-base);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-btn i {
    font-size: 1rem;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.tab-btn.active {
    color: #FFFFFF;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.25) 0%, rgba(6, 182, 212, 0.25) 100%);
    border: 1px solid var(--accent-blue);
    box-shadow: 0 0 12px var(--accent-blue-glow);
}

.tab-text-short {
    display: none;
}
.tab-text-full {
    display: inline;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Icon & Action Buttons */
.icon-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.principle-btn {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2) 0%, rgba(56, 189, 248, 0.2) 100%);
    border-color: rgba(168, 85, 247, 0.4);
    color: #E9D5FF;
}

.principle-btn:hover {
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.3);
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.tab-pane {
    display: none;
    height: 100%;
    padding: 0.6rem 1rem;
    overflow-y: auto;
}

.tab-pane.active {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.simulation-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 0.5rem;
    flex: 1;
    min-height: 0;
}

/* ==========================================================================
   Canvas Viewport Wrapper
   ========================================================================== */
.canvas-container-wrapper {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.canvas-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border-bottom: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge {
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(16, 185, 129, 0.2);
    color: #6EE7B7;
    border: 1px solid rgba(16, 185, 129, 0.4);
}

.badge.secondary {
    background: rgba(56, 189, 248, 0.2);
    color: #7DD3FC;
    border-color: rgba(56, 189, 248, 0.4);
}

.badge.danger {
    background: rgba(239, 68, 68, 0.2);
    color: #FCA5A5;
    border-color: rgba(239, 68, 68, 0.4);
}

.canvas-actions, .btn-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.sm-btn {
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.sm-btn:hover, .sm-btn.active {
    color: var(--text-primary);
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent-blue);
}

.canvas-viewport {
    flex: 1;
    position: relative;
    width: 100%;
    min-height: 420px;
    background: radial-gradient(circle at 50% 30%, #131C31 0%, #090D16 100%);
    overflow: hidden;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
    touch-action: none;
}

canvas:active {
    cursor: grabbing;
}

/* Canvas Overlay Data Chips */
.canvas-overlay-data {
    position: absolute;
    top: 12px;
    left: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    pointer-events: none;
}

.data-chip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: var(--font-family-mono);
}

.data-chip strong {
    color: var(--text-primary);
}

.data-chip i.red { color: var(--accent-red); }
.data-chip i.green { color: var(--accent-green); }
.data-chip i.gold { color: var(--accent-gold); }

/* Interactive Tip Bar */
.interactive-tip {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.1rem;
    background: rgba(15, 23, 42, 0.85);
    border-top: 1px solid var(--border-color);
    font-size: 0.92rem;
    color: #E2E8F0;
    line-height: 1.5;
}

.interactive-tip i {
    color: var(--accent-blue);
    font-size: 1.05rem;
}

/* ==========================================================================
   Control Sidebar & Cards
   ========================================================================== */
.control-sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    overflow-y: auto;
    max-height: calc(100vh - 90px);
    padding-right: 2px;
}

.control-sidebar::-webkit-scrollbar {
    width: 4px;
}
.control-sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.control-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    box-shadow: var(--shadow-sm);
}

.control-card h3 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.35rem;
}

.control-card h3 i {
    color: var(--accent-blue);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.value-display {
    font-family: var(--font-family-mono);
    font-weight: 700;
    color: var(--accent-blue);
    font-size: 0.8rem;
}

/* Range Sliders Styling */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue-glow);
    cursor: pointer;
    transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.25);
}

/* Preset Button Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.4rem;
}

.preset-btn {
    padding: 0.35rem 0.45rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preset-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.preset-btn.active {
    background: rgba(56, 189, 248, 0.15);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    font-weight: 700;
}

/* Toggle Buttons */
.btn-toggle-group {
    display: flex;
    gap: 0.4rem;
}

.toggle-btn {
    flex: 1;
    padding: 0.5rem 0.4rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
}

.toggle-btn.active {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--accent-green);
    color: #6EE7B7;
}

.info-callout {
    padding: 0.85rem 1rem;
    background: rgba(56, 189, 248, 0.12);
    border-left: 4px solid var(--accent-blue);
    border-radius: 8px;
    font-size: 0.92rem;
    color: #E2E8F0;
    line-height: 1.45;
}

.info-callout strong {
    color: var(--accent-blue);
    display: block;
    font-size: 1.02rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    letter-spacing: -0.01em;
}

/* Quick Action Row */
.quick-preset-row {
    display: flex;
    gap: 0.3rem;
}

.sm-action-btn {
    flex: 1;
    padding: 0.4rem 0.2rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.sm-action-btn:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent-blue);
}

/* ==========================================================================
   Bottom Analytics Section
   ========================================================================== */
.bottom-analytics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.analytic-card {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow-sm);
}

.card-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.05rem;
}

.card-icon.blue { background: rgba(56, 189, 248, 0.15); color: var(--accent-blue); }
.card-icon.red { background: rgba(239, 68, 68, 0.15); color: var(--accent-red); }
.card-icon.green { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); }
.card-icon.gold { background: rgba(245, 158, 11, 0.15); color: var(--accent-gold); }

.card-info {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.card-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 600;
}

.card-math {
    font-family: var(--font-family-mono);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.card-value {
    font-family: var(--font-family-mono);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ==========================================================================
   Tab 3: Balloon Special Elements
   ========================================================================== */
.temp-indicator-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.temp-fill {
    height: 100%;
    background: linear-gradient(90deg, #38BDF8 0%, #F59E0B 50%, #EF4444 100%);
    transition: width 0.3s ease;
}

/* ==========================================================================
   Tab 4: Lab Challenge & Quiz Layout
   ========================================================================== */
.lab-quiz-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    height: 100%;
}

.lab-challenge-card, .quiz-section {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.challenge-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.gold-crown {
    font-size: 1.5rem;
    color: var(--accent-gold);
}

.challenge-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.crown-sim-box {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex: 1;
}

.crown-viewport {
    height: 220px;
    background: radial-gradient(circle at 50% 30%, #131C31 0%, #090D16 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.crown-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.step-card {
    padding: 0.6rem 0.8rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.8rem;
}

.step-card.highlight {
    border-color: var(--accent-blue);
    background: rgba(56, 189, 248, 0.1);
}

.step-card h4 {
    color: var(--text-muted);
    font-size: 0.72rem;
    margin-bottom: 0.2rem;
}

.measure-val {
    color: var(--text-primary);
    font-size: 0.8rem;
}

.red-text {
    color: var(--accent-red);
    font-family: var(--font-family-mono);
}

.btn-choice-group {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.4rem;
}

.choice-btn {
    flex: 1;
    padding: 0.45rem 0.55rem; line-height: 1.35;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.choice-btn:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent-blue);
}

.feedback-msg {
    margin-top: 0.3rem;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.45rem 0.55rem; line-height: 1.35;
    border-radius: 8px;
    display: none;
}

.feedback-msg.correct {
    display: block;
    background: rgba(16, 185, 129, 0.2);
    color: #6EE7B7;
    border: 1px solid rgba(16, 185, 129, 0.4);
}

.feedback-msg.wrong {
    display: block;
    background: rgba(239, 68, 68, 0.2);
    color: #FCA5A5;
    border: 1px solid rgba(239, 68, 68, 0.4);
}

/* Quiz Section */
.quiz-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: space-between;
    flex: 1;
}

.quiz-question {
    font-size: 0.88rem;
    font-weight: 700;
    line-height: 1.5;
    color: var(--text-primary);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-opt-btn {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.quiz-opt-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.quiz-opt-btn.selected {
    background: rgba(56, 189, 248, 0.15);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.quiz-opt-btn.correct {
    background: rgba(16, 185, 129, 0.25) !important;
    border-color: var(--accent-green) !important;
    color: #6EE7B7 !important;
}

.quiz-opt-btn.wrong {
    background: rgba(239, 68, 68, 0.25) !important;
    border-color: var(--accent-red) !important;
    color: #FCA5A5 !important;
}

.quiz-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
}

.quiz-progress {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.primary-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-cyan) 100%);
    color: #0F172A;
    font-weight: 700;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.primary-btn:hover {
    box-shadow: 0 0 15px var(--accent-blue-glow);
    transform: translateY(-1px);
}

/* Modal Window */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop.hidden {
    display: none;
}

.modal-content {
    background: #0F172A;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 740px;
    max-height: 92vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 1.2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.05rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-header h2 i {
    color: var(--accent-purple);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}
.close-btn:hover { color: var(--text-primary); }

.modal-body {
    padding: 0.85rem 1.2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.info-section h3 {
    font-size: 0.88rem;
    color: var(--accent-blue);
    margin-bottom: 0.25rem;
}

.info-section p, .info-section ul {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

.info-section ul {
    padding-left: 1.1rem; margin-top: 0.2rem;
}

.formula-box {
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid var(--accent-blue);
    padding: 0.35rem 0.6rem; margin-bottom: 0.3rem;
    border-radius: 8px;
    text-align: center;
    font-family: var(--font-family-mono);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--accent-blue);
    margin: 0.6rem 0;
}

.condition-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-top: 0.3rem;
}

.cond-card {
    padding: 0.45rem 0.55rem; line-height: 1.35;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.03);
    font-size: 0.75rem;
}

.cond-card.float { border-color: rgba(56, 189, 248, 0.4); }
.cond-card.neutral { border-color: rgba(16, 185, 129, 0.4); }
.cond-card.sink { border-color: rgba(239, 68, 68, 0.4); }

.cond-card h4 {
    font-size: 0.8rem;
    margin-bottom: 0.2rem;
}

/* Utilities */
.hidden { display: none !important; }

/* Responsive adjustments */
@media (max-width: 1024px) {
    html, body {
        display: block !important;
        height: auto !important;
        min-height: 100vh;
        overflow-y: auto !important;
        -webkit-overflow-scrolling: touch;
    }

    .app-container {
        height: auto !important;
        min-height: 100vh;
        overflow: visible !important;
        max-width: 100%;
        margin: 0;
    }

    .main-content {
        height: auto !important;
        overflow: visible !important;
        flex: none !important;
        padding: 0.75rem;
    }

    .tab-pane,
    .tab-pane.active {
        height: auto !important;
        min-height: min-content !important;
        overflow: visible !important;
        flex: none !important;
    }

    .simulation-layout {
        grid-template-columns: 1fr;
        height: auto !important;
        gap: 1rem;
    }

    /* Mobile Header Layout */
    .app-header {
        flex-direction: column;
        align-items: stretch;
        padding: 0.75rem 0.85rem;
        gap: 0.75rem;
        border-radius: 0 0 12px 12px;
    }

    .header-left {
        order: 1;
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }

    .tab-text-short {
        display: inline;
    }
    .tab-text-full {
        display: none;
    }

    .nav-tabs {
        order: 2;
        width: 100%;
        display: flex;
        gap: 0.3rem;
        background: rgba(0, 0, 0, 0.4);
        padding: 4px;
        border-radius: 12px;
        border: 1px solid var(--border-color);
        box-sizing: border-box;
    }

    .nav-tabs .tab-btn {
        flex: 1;
        justify-content: center;
        text-align: center;
        padding: 0.6rem 0.3rem;
        font-size: 0.78rem;
        font-weight: 700;
        border-radius: 8px;
        white-space: nowrap;
        gap: 0.35rem;
        color: var(--text-secondary);
        background: transparent;
        border: 1px solid transparent;
        transition: all 0.2s ease;
    }

    .nav-tabs .tab-btn.active {
        background: #00f2fe;
        color: #000000;
        font-weight: 800;
        border: 1px solid #00f2fe;
        box-shadow: 0 0 16px rgba(0, 242, 254, 0.5);
    }

    .nav-tabs .tab-btn.active i {
        color: #000000;
    }

    .header-right {
        order: 3;
        width: 100%;
    }

    .header-right .principle-btn {
        width: 100%;
        justify-content: center;
        padding: 0.6rem;
        font-size: 0.85rem;
    }

    /* Canvas & Controls */
    .canvas-container-wrapper {
        width: 100%;
        height: auto;
        border-radius: 12px;
    }

    .canvas-viewport {
        height: 380px;
        min-height: 320px;
    }

    .canvas-header {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .control-sidebar {
        width: 100%;
        overflow-y: visible;
        max-height: none;
    }

    .bottom-analytics {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .preset-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.35rem;
    }

    .preset-btn {
        padding: 0.45rem 0.25rem;
        font-size: 0.72rem;
    }

    .quick-preset-row {
        gap: 0.3rem;
    }

    .sm-action-btn {
        padding: 0.45rem 0.2rem;
        font-size: 0.72rem;
    }

    .modal-content {
        width: 94%;
        max-height: 88vh;
    }

    .condition-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .title-container h1 {
        font-size: 1rem;
    }

    .nav-tabs .tab-btn {
        padding: 0.5rem 0.15rem;
        font-size: 0.72rem;
    }

    .preset-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .canvas-viewport {
        height: 330px;
    }

    .canvas-overlay-data {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }

    .data-chip {
        font-size: 0.72rem;
        padding: 0.3rem 0.5rem;
    }
}