:root {
    --bg-color: #0d0906; /* Deep dark brown */
    --panel-bg: rgba(255, 255, 255, 0.03);
    --panel-border: rgba(255, 255, 255, 0.05);
    
    --accent-gradient: linear-gradient(135deg, #FF8000, #FF5500);
    --accent-shadow: rgba(255, 128, 0, 0.4);
    
    --text-main: #FFFFFF;
    --text-muted: #8A8581;
    --text-inactive: #4A4643;
    
    --slider-track: rgba(255,255,255,0.1);
    --slider-thumb: #FFFFFF;
    
    --font-stack: 'Outfit', sans-serif;
    --card-radius: 20px;
    --input-radius: 12px;
}

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

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 50% 0%, rgba(255, 128, 0, 0.1) 0%, transparent 40%);
    color: var(--text-main);
    font-family: var(--font-stack);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.app-container {
    display: grid;
    grid-template-columns: 480px 1fr;
    gap: 30px;
    width: 100%;
    max-width: 1100px;
    margin: auto;
}

/* Base Panel Styles */
.calculator-panel, .results-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: calc(var(--card-radius) + 10px);
    padding: 40px;
    box-shadow: 0 25px 50px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    margin-bottom: 35px;
}

header h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

header p {
    color: var(--text-muted);
    font-size: 16px;
    font-weight: 300;
}

/* Input Cards */
.input-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--panel-border);
    border-radius: var(--card-radius);
    padding: 24px;
    margin-bottom: 20px;
    transition: border-color 0.3s ease;
}

.input-card:hover, .input-card:focus-within {
    border-color: rgba(255, 128, 0, 0.3);
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.input-header label {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
}

/* Number Inputs Wrapper */
.input-value-wrapper {
    display: flex;
    align-items: center;
    background: transparent;
    font-size: 24px;
    font-weight: 600;
    color: var(--text-main);
}

.input-value-wrapper input[type="number"] {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-stack);
    font-size: 24px;
    font-weight: 600;
    width: 130px;
    text-align: right;
    outline: none;
    -moz-appearance: textfield;
}

.input-value-wrapper input[type="number"]::-webkit-outer-spin-button,
.input-value-wrapper input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.currency {
    margin-right: 4px;
    color: var(--text-main);
}

.percentage, .months {
    margin-left: 6px;
    font-size: 16px;
    color: var(--text-muted);
    font-weight: 400;
}

/* Inline Text Input (Matches Number Inputs) */
.inline-text-input {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-stack);
    font-size: 22px;
    font-weight: 600;
    width: 100%;
    text-align: right;
    outline: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom 0.2s;
}

.inline-text-input:focus {
    border-bottom: 1px solid rgba(255, 128, 0, 0.5);
}

.inline-text-input::placeholder {
    color: rgba(255,255,255,0.1);
    font-weight: 400;
    font-size: 18px;
}

/* Sliders */
.slider-container {
    width: 100%;
}

.custom-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--slider-track);
    border-radius: 4px;
    outline: none;
    margin: 10px 0;
    position: relative;
    cursor: pointer;
}

/* Filled track will be handled by JS background property */

.custom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
    border: 2px solid var(--text-main);
    transition: transform 0.1s;
}

.custom-slider::-webkit-slider-thumb:hover, .custom-slider::-webkit-slider-thumb:active {
    transform: scale(1.2);
}

.custom-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
    border: 2px solid var(--text-main);
    transition: transform 0.1s;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-inactive);
    margin-top: 6px;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: var(--input-radius);
    background: var(--accent-gradient);
    color: white;
    font-family: var(--font-stack);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 10px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 8px 16px var(--accent-shadow);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 20px rgba(255, 128, 0, 0.6);
}

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

/* Results Panel */
.results-panel h2 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 24px;
}

.plans-scroll-area {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 10px;
    margin-right: -10px;
}

.plans-scroll-area::-webkit-scrollbar {
    width: 6px;
}
.plans-scroll-area::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.02);
    border-radius: 3px;
}
.plans-scroll-area::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
}

#plans-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.empty-state {
    text-align: center;
    color: var(--text-inactive);
    padding: 40px 20px;
    border: 2px dashed var(--panel-border);
    border-radius: var(--card-radius);
    font-size: 15px;
    line-height: 1.6;
}

/* Plan Card */
.plan-card {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--panel-border);
    border-radius: var(--card-radius);
    padding: 24px;
    position: relative;
    overflow: hidden;
    animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.plan-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.plan-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

.plan-emi {
    display: flex;
    flex-direction: column;
}

.plan-emi span {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.plan-emi h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-main);
}
.plan-emi h3 small {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-muted);
}

.delete-btn {
    background: transparent;
    border: none;
    color: var(--text-inactive);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
    padding: 0 5px;
}

.delete-btn:hover {
    color: #FF4444;
}

.plan-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--panel-border);
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-item span.label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.detail-item span.value {
    font-size: 16px;
    font-weight: 500;
}

@media (max-width: 900px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    .calculator-panel, .results-panel {
        padding: 30px 20px;
    }
}

@media (max-width: 768px) {
    #main-app {
        grid-template-columns: 1fr;
    }
    
    .main-panel {
        padding: 30px 20px;
    }
}

/* Modal Overlay Styles */
.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.85);
    display: flex; align-items: center; justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(8px);
}
.modal-content {
    background: #0d0906;
    border: 1px solid rgba(255, 128, 0, 0.3);
    padding: 30px;
    border-radius: var(--card-radius);
    width: 90%;
    max-width: 420px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.8);
    transform: translateY(0);
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes modalPop {
    0% { transform: translateY(20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}
.modal-content h3 {
    color: #FF8000; margin-bottom: 10px; font-size: 22px;
}
.modal-actions {
    display: flex; gap: 12px; margin-top: 24px;
}
.secondary-btn {
    flex: 1; padding: 14px; background: rgba(255,255,255,0.08); color: #fff;
    border: none; border-radius: var(--input-radius); cursor: pointer;
    font-family: inherit; font-size: 15px; font-weight: 500;
    transition: background 0.2s;
}
.secondary-btn:hover { background: rgba(255,255,255,0.15); }

/* Amortization Table */
.toggle-table-btn {
    width: 100%;
    margin-top: 16px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    border-radius: var(--input-radius);
    color: var(--text-main);
    font-family: var(--font-stack);
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

.toggle-table-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}
.print-btn {
    padding: 12px;
    background: rgba(255, 128, 0, 0.1);
    border: 1px solid rgba(255, 128, 0, 0.3);
    border-radius: var(--input-radius);
    color: #FF8000;
    font-family: var(--font-stack);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.print-btn:hover {
    background: rgba(255, 128, 0, 0.2);
    color: #fff;
}

.table-container {
    margin-top: 16px;
    max-height: 300px;
    overflow-y: auto;
    border-radius: var(--input-radius);
    background: var(--bg-deep);
    padding: 2px 12px;
}

.table-container::-webkit-scrollbar {
    width: 4px;
}
.table-container::-webkit-scrollbar-track {
    background: transparent;
}
.table-container::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 2px;
}

.amortization-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: right;
}

.amortization-table th, .amortization-table td {
    padding: 10px 12px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.amortization-table th {
    position: sticky;
    top: 0;
    background: rgba(20, 20, 20, 0.95);
    color: var(--text-muted);
    font-weight: 500;
    z-index: 10;
    backdrop-filter: blur(5px);
}

.amortization-table td:first-child, .amortization-table th:first-child {
    text-align: center;
}

.amortization-table tr:last-child td {
    border-bottom: none;
}

.amortization-table .interest-col {
    color: #FF8000;
}

/* Auth UI */
.auth-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.auth-card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: var(--card-radius);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 25px 50px rgba(0,0,0,0.5);
}

.auth-card h2 {
    font-size: 28px;
    margin-bottom: 10px;
}

.auth-card p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
    line-height: 1.4;
}

.auth-input-group {
    text-align: left;
    margin-bottom: 16px;
}

.auth-input-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-muted);
    font-size: 13px;
}

.auth-input-group input {
    width: 100%;
    padding: 12px;
    background: rgba(0,0,0,0.4);
    border: 1px solid var(--panel-border);
    border-radius: var(--input-radius);
    color: var(--text-main);
    font-family: var(--font-stack);
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
}

.auth-input-group input:focus {
    border-color: rgba(255, 128, 0, 0.5);
}

.google-btn {
    width: 100%;
    padding: 12px;
    margin-top: 16px;
    background: white;
    color: #333;
    border: none;
    border-radius: var(--input-radius);
    font-family: var(--font-stack);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform 0.2s;
}

.google-btn:hover {
    transform: translateY(-2px);
}

.google-btn img {
    height: 20px;
}

.auth-toggle {
    margin-top: 20px;
    font-size: 14px;
}

#auth-toggle-btn {
    color: #FF8000;
    cursor: pointer;
    font-weight: 500;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logout-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    color: var(--text-muted);
    padding: 8px 16px;
    font-family: var(--font-stack);
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
}

.logout-btn:hover {
    color: white;
    background: rgba(255,128,0,0.2);
    border-color: rgba(255,128,0,0.5);
}