/* Modern Dark CSS Design System */

:root {
    --bg-dark: #090a16;
    --card-bg: rgba(17, 20, 40, 0.65);
    --card-border: rgba(255, 255, 255, 0.07);
    --text-primary: #f1f3f9;
    --text-secondary: #9aa2c0;
    
    --primary-color: #6366f1; /* Indigo */
    --primary-glow: rgba(99, 102, 241, 0.15);
    --secondary-color: #06b6d4; /* Teal / Cyan */
    --secondary-glow: rgba(6, 182, 212, 0.15);
    
    --accent-error: #f43f5e;
    --accent-success: #10b981;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow-x: hidden;
    position: relative;
}

/* Background Glowing Circles */
.background-decorations {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.blur-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.45;
}

.circle-1 {
    top: -10%;
    right: 5%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--primary-color) 0%, rgba(99,102,241,0) 70%);
}

.circle-2 {
    bottom: -10%;
    left: -5%;
    width: 45vw;
    height: 45vw;
    background: radial-gradient(circle, var(--secondary-color) 0%, rgba(6,182,212,0) 70%);
}

/* App Container Layout */
.app-container {
    max-width: 1000px;
    width: 100%;
    margin: 0 auto;
    padding: 3rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 1rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
}

.logo i {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text {
    font-weight: 400;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.logo-text .bold {
    font-weight: 800;
    color: var(--secondary-color);
}

.app-header h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 30%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Cards & Glassmorphism */
.glass {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
    transition: var(--transition-smooth);
}

.card {
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.8rem;
}

.card-header i {
    font-size: 1.25rem;
    color: var(--secondary-color);
}

.card-header h2 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

/* Input Fields Styling */
.input-group-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper i {
    position: absolute;
    left: 1.2rem;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
    font-size: 0.95rem;
}

.input-wrapper input {
    width: 100%;
    padding: 0.95rem 1.2rem 0.95rem 2.8rem;
    border-radius: 12px;
    border: 1.5px solid var(--card-border);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    outline: none;
    transition: var(--transition-smooth);
}

.input-wrapper input:focus {
    border-color: var(--secondary-color);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: 0 0 15px var(--secondary-glow);
}

.input-wrapper input:focus + i {
    color: var(--secondary-color);
}

/* Error States */
.error-container {
    margin-top: 1.2rem;
    padding: 0.8rem 1.2rem;
    background: rgba(244, 63, 94, 0.1);
    border: 1px solid rgba(244, 63, 94, 0.2);
    border-radius: 10px;
    color: var(--accent-error);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.88rem;
    font-weight: 500;
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Result Card */
.result-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.result-highlight {
    text-align: center;
    margin: auto 0;
    padding: 1.5rem 0;
}

.result-label {
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
}

.counter-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.3rem;
}

.count-value {
    font-family: var(--font-heading);
    font-size: 5.5rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, #ffffff 40%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px var(--secondary-glow));
    transition: var(--transition-smooth);
}

.count-unit {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.formula-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.8rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.formula-box i {
    color: var(--secondary-color);
}

/* Timeline Card */
.timeline-visual-wrapper {
    position: relative;
    padding: 2.5rem 1rem;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 15px;
    overflow-x: auto;
}

.timeline-track {
    position: relative;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin: 1.5rem 2rem;
    min-width: 450px;
}

.timeline-tick {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tick-dot {
    width: 12px;
    height: 12px;
    background: var(--text-secondary);
    border-radius: 50%;
    border: 2.5px solid var(--bg-dark);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.timeline-tick:hover .tick-dot,
.timeline-tick.extreme .tick-dot {
    background: var(--secondary-color);
    box-shadow: 0 0 10px var(--secondary-color);
    transform: scale(1.3);
}

.tick-label {
    position: absolute;
    top: 15px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: var(--transition-smooth);
}

.timeline-tick:hover .tick-label,
.timeline-tick.extreme .tick-label {
    color: var(--text-primary);
    font-size: 0.88rem;
}

/* Values List Card */
.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.list-display-container {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 15px;
    padding: 1.5rem;
    max-height: 250px;
    overflow-y: auto;
    border: 1px solid rgba(255, 255, 255, 0.02);
}

/* Custom Scrollbar */
.list-display-container::-webkit-scrollbar,
.timeline-visual-wrapper::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.list-display-container::-webkit-scrollbar-track,
.timeline-visual-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.list-display-container::-webkit-scrollbar-thumb,
.timeline-visual-wrapper::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.list-display-container::-webkit-scrollbar-thumb:hover,
.timeline-visual-wrapper::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 0.75rem;
}

.value-badge {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 0.6rem 0.4rem;
    text-align: center;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.value-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--primary-color);
    opacity: 0;
    transition: var(--transition-smooth);
}

.value-badge:hover {
    background: rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
}

.value-badge:hover::before {
    opacity: 1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.2rem;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    outline: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-secondary:active {
    transform: scale(0.97);
}

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

/* Footer */
.app-footer {
    text-align: center;
    padding: 2rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    margin-top: auto;
}