/* Modern Reset and CSS Variables */
:root {
    --bg-color: #0f1115;
    --panel-bg: rgba(26, 30, 36, 0.7);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f0f2f5;
    --text-secondary: #a0aab2;
    --accent-color: #d4a373;
    /* Coffee-inspired accent */
    --accent-hover: #faedcd;
    --accent-glow: rgba(212, 163, 115, 0.4);
    --slider-track: #2a2e35;
    --danger: #ef476f;
    --font-main: 'Inter', sans-serif;
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 15% 50%, rgba(212, 163, 115, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(160, 170, 178, 0.03) 0%, transparent 50%);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
    margin-bottom: 1rem;
    animation: fadeInDown 0.8s ease-out;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff, var(--accent-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.dashboard {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    align-items: stretch;
}

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

/* Glassmorphism Panels */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.8s ease-out backwards;
}

.control-panel {
    animation-delay: 0.1s;
}

.visualization-panel {
    animation-delay: 0.2s;
    display: flex;
    flex-direction: column;
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 0.75rem;
}

.panel-header h2 {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.mode-select {
    background: rgba(0, 0, 0, 0.5);
    color: var(--accent-hover);
    border: 1px solid var(--panel-border);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-family: var(--font-main);
    font-weight: 500;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

.mode-select:hover {
    border-color: rgba(212, 163, 115, 0.4);
}

.hidden {
    display: none !important;
}

/* Controls */
.input-group {
    margin-bottom: 1.75rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.calc-note {
    font-size: 0.75rem;
    opacity: 0.6;
    font-weight: normal;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

input[type="range"] {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--slider-track);
    border-radius: 3px;
    outline: none;
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 15px var(--accent-glow);
}

input[type="range"]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px rgba(212, 163, 115, 0.3);
}

.value-display {
    min-width: 75px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-hover);
    background: rgba(0, 0, 0, 0.2);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Button */
.primary-btn {
    width: 100%;
    padding: 1rem;
    margin-top: 1rem;
    background: linear-gradient(135deg, #c7905c, var(--accent-color));
    color: #1a1512;
    border: none;
    border-radius: 8px;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(212, 163, 115, 0.2);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
    background: linear-gradient(135deg, #d4a373, #faedcd);
}

.primary-btn:active {
    transform: translateY(1px);
}

/* Chart Area */
.chart-container {
    flex-grow: 1;
    position: relative;
    min-height: 350px;
    width: 100%;
}

/* Metrics */
.metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--panel-border);
}

.metric-card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
    transition: var(--transition);
}

.metric-card:hover {
    background: rgba(255, 255, 255, 0.02);
    border-color: rgba(212, 163, 115, 0.2);
}

.metric-card h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.metric-card p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-hover);
    font-variant-numeric: tabular-nums;
    transition: var(--transition);
}

.sub-metric {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: -0.25rem;
    font-weight: 500;
}

/* Puck Visualizer */
.puck-visualizer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--panel-border);
}

.puck-visualizer h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.puck-area {
    width: 100%;
    height: 120px;
    background-color: #1f1a18;
    border-radius: 12px;
    border: 2px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 10px 20px rgba(0, 0, 0, 0.5);
}

.coffee-grounds {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(var(--grain-color, #4a3831) var(--grain-size, 1px), transparent var(--grain-size, 1px));
    background-size: var(--grain-spacing, 10px) var(--grain-spacing, 10px);
    opacity: 0.9;
    transition: all 0.5s ease;
}

.puck-label {
    position: relative;
    z-index: 2;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
    color: #fff;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Text Button */
.text-btn {
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
    text-decoration: underline;
    text-decoration-color: transparent;
}

.text-btn:hover {
    color: var(--accent-hover);
    text-decoration-color: var(--accent-hover);
    background: rgba(212, 163, 115, 0.1);
}

/* Math Info Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(6px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    max-width: 800px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    padding: 3rem;
    background: var(--bg-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.close-btn {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2.5rem;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--danger);
    transform: scale(1.1);
}

.modal-body {
    margin-top: 2rem;
}

.modal-body h3 {
    font-size: 1.15rem;
    color: var(--accent-color);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
    padding-bottom: 0.25rem;
}

.modal-body p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.math-block {
    background: rgba(0, 0, 0, 0.4);
    padding: 1.25rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    margin: 1.5rem 0;
    overflow-x: auto;
    text-align: center;
    font-size: 1.15rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Specific Mobile Overrides */
@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .glass-panel {
        padding: 1.5rem;
    }

    .metrics {
        grid-template-columns: 1fr;
    }

    .modal-content {
        padding: 1.5rem;
    }

    .close-btn {
        top: 0.5rem;
        right: 1rem;
    }

    .modal-body h3 {
        font-size: 1.05rem;
    }

    .math-block {
        font-size: 1rem;
        padding: 1rem;
    }

    .math-block ul {
        grid-template-columns: 1fr !important;
    }
}