:root {
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e1b4b;
    --calc-bg: rgba(255, 255, 255, 0.05);
    --calc-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --btn-bg: rgba(255, 255, 255, 0.03);
    --btn-hover: rgba(255, 255, 255, 0.1);
    --btn-active: rgba(255, 255, 255, 0.05);
    --accent-color: #8b5cf6;
    --accent-hover: #7c3aed;
    --op-color: #ec4899;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-main);
    overflow-x: hidden;
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 30;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 280px;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--calc-border);
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 40px;
    z-index: 40;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.active {
    transform: translateX(0);
}

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

.sidebar-header h2 {
    font-size: 28px;
    background: linear-gradient(45deg, var(--accent-color), var(--op-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}

.close-sidebar {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 32px;
    line-height: 1;
    cursor: pointer;
    display: block;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--calc-border);
    z-index: 10;
}

.mobile-header h2 {
    font-size: 20px;
    background: linear-gradient(45deg, var(--accent-color), var(--op-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-main);
    padding: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-body {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.calculator-wrapper {
    position: relative;
    padding: 20px;
}

/* Subtle glow behind calculator */
.calculator-wrapper::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: 0;
    filter: blur(40px);
}

.calculator {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 340px;
    background: var(--calc-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--calc-border);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.display {
    text-align: right;
    margin-bottom: 24px;
    padding: 10px;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    word-break: break-all;
}

.history {
    font-size: 14px;
    color: var(--text-muted);
    min-height: 20px;
    margin-bottom: 8px;
    font-weight: 300;
}

.current {
    font-size: 40px;
}

/* Sidebar Nav */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1; 
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.nav-btn.active {
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent-color);
}

/* Calendar Styles */
.calendar-wrapper {
    position: relative;
    padding: 20px;
    width: 100%;
    max-width: 400px;
}

.calendar {
    background: var(--calc-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--calc-border);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

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

.calendar-header h3 {
    font-size: 20px;
    font-weight: 600;
}

.calendar-header button {
    background: var(--btn-bg);
    border: none;
    color: var(--text-main);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.calendar-header button:hover {
    background: var(--btn-hover);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.calendar-cell {
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    border-radius: 50%;
    cursor: default;
}

.calendar-cell.empty {
    opacity: 0;
}

.calendar-cell:not(.empty):hover {
    background: var(--btn-hover);
    cursor: pointer;
}

.calendar-cell.today {
    background: var(--accent-color);
    font-weight: 600;
}

/* Converter Styles */
.converter-wrapper {
    position: relative;
    padding: 20px;
    width: 100%;
    max-width: 400px;
}

.converter {
    background: var(--calc-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--calc-border);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.converter h3 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 22px;
    font-weight: 600;
}

.input-group, .select-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.input-group label, .select-group label {
    font-size: 14px;
    color: var(--text-muted);
}

.input-group input, .select-group select {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--calc-border);
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 16px;
    outline: none;
    transition: all 0.2s;
}

.input-group input:focus, .select-group select:focus {
    border-color: var(--accent-color);
}

.select-group select option {
    background: var(--bg-gradient-end);
    color: var(--text-main);
}

/* Custom Searchable Dropdown */
.custom-select {
    position: relative;
    width: 100%;
}

.custom-select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--calc-border);
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 15px;
    cursor: pointer;
    transition: border-color 0.2s;
    user-select: none;
    gap: 8px;
}

.custom-select-trigger:hover,
.custom-select.open .custom-select-trigger {
    border-color: var(--accent-color);
}

.custom-select .chevron {
    transition: transform 0.2s;
    flex-shrink: 0;
    color: var(--text-muted);
}

.custom-select.open .chevron {
    transform: rotate(180deg);
}

.custom-select-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: rgba(20, 20, 50, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--calc-border);
    border-radius: 12px;
    z-index: 100;
    overflow: hidden;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.custom-select.open .custom-select-dropdown {
    display: block;
}

.select-search {
    width: 100%;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-bottom: 1px solid var(--calc-border);
    color: var(--text-main);
    font-size: 14px;
    outline: none;
}

.select-search::placeholder {
    color: var(--text-muted);
}

.options-list {
    max-height: 200px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) transparent;
}

.option-item {
    display: flex;
    flex-direction: column;
    padding: 10px 14px;
    cursor: pointer;
    transition: background 0.15s;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.option-item:hover {
    background: rgba(139, 92, 246, 0.15);
}

.option-item.selected {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-color);
}

.option-code {
    font-size: 15px;
    font-weight: 600;
}

.option-country {
    font-size: 12px;
    color: var(--text-muted);
}

.option-item.no-result {
    color: var(--text-muted);
    font-size: 14px;
    cursor: default;
}

.currency-selectors {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    margin-bottom: 24px;
}

.currency-selectors .select-group {
    flex: 1;
    margin-bottom: 0;
    min-width: 0;
}

.swap-btn {
    background: var(--btn-bg);
    border: none;
    color: var(--text-main);
    width: 48px;
    height: 48px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.swap-btn:hover {
    background: var(--btn-hover);
    color: var(--accent-color);
}

.result-box {
    background: rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: 16px;
    text-align: center;
    margin-bottom: 12px;
    border: 1px solid var(--calc-border);
}

#convert-result {
    font-size: 28px;
    font-weight: 600;
    color: var(--accent-color);
    word-break: break-all;
}

.rate-info {
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}


.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.btn {
    border: none;
    outline: none;
    background: var(--btn-bg);
    color: var(--text-main);
    font-size: 20px;
    padding: 16px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05),
                0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    background: var(--btn-hover);
    transform: translateY(-2px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1),
                0 6px 12px rgba(0, 0, 0, 0.2);
}

.btn:active, .btn.active-sim {
    background: var(--btn-active);
    transform: translateY(0);
}

.btn.fn {
    color: var(--text-muted);
    font-size: 18px;
}

.btn.op {
    color: var(--op-color);
    font-size: 24px;
}

.btn.equals {
    background: var(--accent-color);
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.btn.equals:hover {
    background: var(--accent-hover);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
}

/* Auth Container Styles */
.auth-container {
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

.user-profile {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 16px;
    background: var(--calc-bg);
    border: 1px solid var(--calc-border);
    padding: 24px 16px;
    border-radius: 20px;
}

#user-avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-color);
    padding: 2px;
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.welcome-text {
    font-size: 12px;
    color: var(--text-muted);
}

#user-name {
    font-weight: 600;
    font-size: 18px;
}

.logout-btn {
    background: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
    padding: 8px 24px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    outline: none;
    width: 100%;
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.4);
    color: #fff;
}

/* Protected Route Styles */
.login-message {
    text-align: center;
    background: var(--calc-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--calc-border);
    padding: 40px;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    margin: 0 20px;
    animation: fadeIn 0.5s ease-out;
}

.login-message h2 {
    margin-bottom: 12px;
    font-size: 28px;
    background: linear-gradient(45deg, var(--accent-color), var(--op-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-message p {
    color: var(--text-muted);
    line-height: 1.5;
}

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

/* Responsive Desktop Layout */
@media (min-width: 768px) {
    body {
        flex-direction: row;
    }
    
    .sidebar {
        position: static;
        transform: translateX(0);
        height: 100vh;
        background: rgba(15, 23, 42, 0.4);
    }
    
    .sidebar-overlay, .close-sidebar, .mobile-header {
        display: none !important;
    }
    
    .calculator {
        padding: 24px;
    }
}