/* ===== Premium Modern UI - Retirement Calculator ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

:root {
    /* Enhanced Color System */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;

    --purple-500: #a855f7;
    --purple-600: #9333ea;

    --amber-500: #f59e0b;
    --emerald-500: #10b981;

    /* Light Theme */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;

    --border-light: rgba(148, 163, 184, 0.2);
    --border-medium: rgba(148, 163, 184, 0.3);

    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px rgba(15, 23, 42, 0.08);

    /* Dark Theme */
    --dark-bg-primary: #0a0a0f;
    --dark-bg-secondary: #16161d;
    --dark-bg-tertiary: #1e1e28;

    --dark-text-primary: #f8fafc;
    --dark-text-secondary: #cbd5e1;
    --dark-text-tertiary: #64748b;

    --dark-glass-bg: rgba(30, 30, 40, 0.6);
    --dark-glass-border: rgba(255, 255, 255, 0.08);
    --dark-glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Theme Application */
[data-theme='light'] {
    --bg-app: var(--bg-primary);
    --bg-card: var(--bg-secondary);
    --bg-subtle: var(--bg-tertiary);
    --text-1: var(--text-primary);
    --text-2: var(--text-secondary);
    --text-3: var(--text-tertiary);
    --border: var(--border-light);
    --glass: var(--glass-bg);
    --glass-b: var(--glass-border);
    --shadow: var(--glass-shadow);
}

[data-theme='dark'] {
    --bg-app: var(--dark-bg-primary);
    --bg-card: var(--dark-bg-secondary);
    --bg-subtle: var(--dark-bg-tertiary);
    --text-1: var(--dark-text-primary);
    --text-2: var(--dark-text-secondary);
    --text-3: var(--dark-text-tertiary);
    --border: var(--border-medium);
    --glass: var(--dark-glass-bg);
    --glass-b: var(--dark-glass-border);
    --shadow: var(--dark-glass-shadow);
}

/* ===== Base Reset ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
    background: var(--bg-app);
    color: var(--text-1);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition-base), color var(--transition-base);
    position: relative;
}

/* ===== Ambient Background ===== */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(168, 85, 247, 0.12) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: ambientMove 20s ease-in-out infinite;
}

@keyframes ambientMove {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    33% {
        transform: translate(2%, -2%) rotate(1deg);
    }

    66% {
        transform: translate(-2%, 2%) rotate(-1deg);
    }
}

[data-theme='dark'] body::before {
    background:
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(168, 85, 247, 0.06) 0%, transparent 50%);
}

/* ===== App Container ===== */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

/* ===== Navigation ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    background: var(--glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-b);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
}

.navbar:hover {
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.12);
    transform: translateY(-1px);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-box {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--purple-500) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 1.25rem;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    transition: transform var(--transition-spring);
}

.logo-box:hover {
    transform: scale(1.05) rotate(5deg);
}

.brand-name {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-1) 0%, var(--text-2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.theme-switch {
    position: relative;
    width: 44px;
    height: 44px;
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    overflow: hidden;
}

.theme-switch::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-500), var(--purple-500));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.theme-switch:hover {
    border-color: var(--primary-500);
    transform: scale(1.05);
}

.theme-switch:hover::before {
    opacity: 0.1;
}

.icon {
    position: relative;
    z-index: 1;
    width: 20px;
    height: 20px;
    color: var(--text-2);
    transition: all var(--transition-base);
}

.theme-switch:hover .icon {
    color: var(--primary-600);
    transform: rotate(20deg);
}

[data-theme='light'] .sun-icon {
    display: none;
}

[data-theme='light'] .moon-icon {
    display: block;
}

[data-theme='dark'] .sun-icon {
    display: block;
}

[data-theme='dark'] .moon-icon {
    display: none;
}

/* ===== Main Grid ===== */
.main-grid {
    display: grid;
    grid-template-columns: minmax(380px, 1fr) minmax(0, 1.4fr);
    gap: var(--space-6);
    align-items: start;
}

@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Glass Panel ===== */
.glass-panel {
    background: var(--glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-b);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.glass-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.glass-panel:hover::before {
    opacity: 1;
}

.glass-panel:hover {
    box-shadow: 0 12px 48px rgba(15, 23, 42, 0.15);
    transform: translateY(-2px);
}

/* ===== Card Styles ===== */
.card {
    padding: var(--space-8);
}

.card-header h2,
.card-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-2);
    color: var(--text-1);
}

.card-header p {
    color: var(--text-2);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ===== Form Styles ===== */
.modern-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.form-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-item label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-2);
    letter-spacing: -0.01em;
}

.input-container,
.select-container {
    position: relative;
}

select,
input[type="date"] {
    width: 100%;
    padding: var(--space-4) var(--space-5);
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-1);
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    outline: none;
    appearance: none;
    transition: all var(--transition-base);
    cursor: pointer;
}

select:hover,
input[type="date"]:hover {
    border-color: var(--primary-500);
}

select:focus,
input[type="date"]:focus {
    border-color: var(--primary-600);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

.select-chevron {
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-3);
    transition: all var(--transition-base);
}

.select-container:focus-within .select-chevron {
    color: var(--primary-600);
    transform: translateY(-50%) rotate(180deg);
}

/* ===== Buttons ===== */
.action-buttons {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    flex: 2;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--purple-600) 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.5);
    transform: translateY(-2px);
}

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

.btn-ghost {
    flex: 1;
    background: var(--bg-subtle);
    color: var(--text-2);
    border: 1.5px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-card);
    color: var(--text-1);
    border-color: var(--primary-500);
}

.btn-arrow {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-base);
}

.btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

/* ===== Policy Card ===== */
.policy-card {
    padding: var(--space-6);
    margin-top: var(--space-6);
}

.toggle-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    padding: var(--space-2);
    margin: calc(var(--space-2) * -1);
    border-radius: var(--radius-md);
    transition: background var(--transition-base);
}

.toggle-header:hover {
    background: var(--bg-subtle);
}

.toggle-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.toggle-icon {
    width: 24px;
    height: 24px;
    color: var(--text-3);
    transition: all var(--transition-base);
}

.policy-card.active .toggle-icon {
    transform: rotate(180deg);
    color: var(--primary-600);
}

.policy-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.policy-card.active .policy-content {
    max-height: 600px;
}

.policy-list {
    margin-top: var(--space-4);
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.policy-list li {
    position: relative;
    padding-left: var(--space-5);
    color: var(--text-2);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.policy-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--primary-500);
    border-radius: 50%;
}

/* ===== Results Section ===== */
.results-section {
    min-height: 400px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    text-align: center;
    padding: var(--space-12);
    background: var(--bg-subtle);
    border: 2px dashed var(--border);
    border-radius: var(--radius-2xl);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    opacity: 0.4;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: var(--space-2);
}

.empty-state p {
    color: var(--text-3);
    max-width: 320px;
}

.results-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    animation: fadeSlideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

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

/* ===== Hero Result ===== */
.hero-result {
    padding: var(--space-10);
    text-align: center;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--purple-600) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-result::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 60%);
    animation: heroRotate 25s linear infinite;
}

@keyframes heroRotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.hero-label {
    position: relative;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.9;
    margin-bottom: var(--space-2);
}

.hero-date {
    position: relative;
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin: var(--space-4) 0;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.hero-sub {
    position: relative;
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.tag {
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ===== Bento Grid ===== */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.bento-item {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transition: all var(--transition-base);
}

.bento-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.15);
}

.bento-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.bento-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-1);
    letter-spacing: -0.01em;
}

/* ===== Countdown ===== */
.countdown-card {
    padding: var(--space-8);
    text-align: center;
}

.countdown-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-3);
    margin-bottom: var(--space-6);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: var(--amber-500);
    border-radius: 50%;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.3);
    }
}

.countdown-timer {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.timer-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
}

.timer-val {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--text-1);
    font-variant-numeric: tabular-nums;
}

.timer-lbl {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .app-container {
        padding: var(--space-4);
        gap: var(--space-4);
    }

    .navbar {
        padding: var(--space-3) var(--space-4);
    }

    .card {
        padding: var(--space-6);
    }

    .hero-date {
        font-size: 2rem;
    }

    .timer-val {
        font-size: 2rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn-primary,
    .btn-ghost {
        flex: 1;
    }
}

/* ===== Utility ===== */
[hidden] {
    display: none !important;
}