:root {
    --bg-color: #0a0c10;
    --card-bg: #141720;
    --text-primary: #ffffff;
    --text-secondary: #7a8599;
    --accent-color: #00c87a;
    --accent-hover: #00b06f;
    --accent-glow: rgba(0, 200, 122, 0.25);
    --accent-glow-soft: rgba(0, 200, 122, 0.1);
    --input-bg: #1e2230;
    --border-color: #2a3042;
    --font-family: 'Inter', sans-serif;
    --transition-speed: 0.25s;
    --easing: cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
    position: relative;
}

/* ─── Animated Background Orbs ─── */
.bg-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    animation: orbFadeIn 1.5s ease forwards;
}

.bg-orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 200, 122, 0.18) 0%, transparent 70%);
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    animation: orbFadeIn 1.5s ease forwards, orbFloat1 12s ease-in-out infinite 1.5s;
}

.bg-orb-2 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(20, 140, 255, 0.12) 0%, transparent 70%);
    bottom: 15%;
    left: 10%;
    animation: orbFadeIn 1.5s ease 0.3s forwards, orbFloat2 10s ease-in-out infinite 1.8s;
}

.bg-orb-3 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(140, 60, 220, 0.1) 0%, transparent 70%);
    top: 20%;
    right: 8%;
    animation: orbFadeIn 1.5s ease 0.5s forwards, orbFloat3 14s ease-in-out infinite 2s;
}

@keyframes orbFadeIn {
    to {
        opacity: 1;
    }
}

@keyframes orbFloat1 {

    0%,
    100% {
        transform: translateX(-50%) translateY(0px);
    }

    50% {
        transform: translateX(-50%) translateY(40px);
    }
}

@keyframes orbFloat2 {

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

    33% {
        transform: translate(30px, -20px);
    }

    66% {
        transform: translate(-15px, 25px);
    }
}

@keyframes orbFloat3 {

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

    40% {
        transform: translate(-25px, 20px);
    }

    70% {
        transform: translate(15px, -15px);
    }
}

/* ─── Particle Canvas ─── */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* ─── Info Button ─── */
.info-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(30, 34, 48, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: all 0.3s var(--easing);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.info-btn:hover {
    background: rgba(0, 200, 122, 0.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: scale(1.05);
}

.info-btn:active {
    transform: scale(0.95);
}

.info-btn svg {
    pointer-events: none;
}

/* ─── Modal Overlay ─── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--easing);
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ─── Modal ─── */
.modal {
    background: linear-gradient(145deg, rgba(22, 26, 38, 0.98), rgba(16, 19, 28, 0.95));
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 32px 28px;
    max-width: 420px;
    width: 100%;
    position: relative;
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s var(--easing);
    text-align: center;
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

/* Modal glow effect */
.modal::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 25px;
    padding: 1px;
    background: linear-gradient(135deg, var(--accent-color), transparent 50%, rgba(20, 140, 255, 0.3));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.5;
    pointer-events: none;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s var(--easing);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.modal-close:active {
    transform: scale(0.9);
}

.modal-close svg {
    pointer-events: none;
}

.modal-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 200, 122, 0.15), rgba(0, 200, 122, 0.05));
    border: 1px solid rgba(0, 200, 122, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--accent-color);
}

.modal h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #ffffff 30%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-description {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 24px;
}

.modal-description strong {
    color: var(--text-primary);
    font-weight: 600;
}

.modal-credits {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.modal-credits strong {
    color: var(--accent-color);
    font-weight: 600;
}

.modal-github-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s var(--easing);
    margin-bottom: 20px;
    box-shadow: 0 4px 16px rgba(0, 200, 122, 0.3);
}

.modal-github-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 200, 122, 0.4);
}

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

.modal-github-btn svg {
    pointer-events: none;
}

.modal-disclaimer {
    font-size: 0.72rem;
    color: var(--text-secondary);
    opacity: 0.6;
}

/* ─── Container ─── */
.container {
    width: 100%;
    max-width: 460px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
    z-index: 1;
}

/* ─── Header ─── */
header {
    text-align: center;
}

#app-title,
#app-subtitle {
    transition: opacity 0.15s ease, transform 0.15s ease;
}

header h1 {
    font-size: 2.1rem;
    font-weight: 800;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 30%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ─── Calculator Card ─── */
.calculator-card {
    background: linear-gradient(145deg, rgba(22, 26, 38, 0.95), rgba(16, 19, 28, 0.9));
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 24px;
    position: relative;
    overflow: hidden;
}

/* Animated border glow */
.calculator-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 25px;
    padding: 1px;
    background: linear-gradient(135deg, var(--accent-color), transparent 50%, rgba(20, 140, 255, 0.3));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    background-size: 200% 200%;
    animation: borderGlow 4s linear infinite;
    opacity: 0.5;
    pointer-events: none;
}

@keyframes borderGlow {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

/* ─── Calc View Transitions ─── */
.calc-view {
    display: none;
}

.calc-view.active {
    display: block;
    animation: viewSlideIn 0.4s var(--easing);
}

@keyframes viewSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* ─── Mode Selector ─── */
.mode-selector {
    display: flex;
    background-color: var(--input-bg);
    border-radius: 12px;
    padding: 3px;
    margin-bottom: 20px;
    gap: 2px;
}

.mode-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 10px 10px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s var(--easing);
    font-family: var(--font-family);
    white-space: nowrap;
}

.mode-btn svg {
    opacity: 0.55;
    transition: all 0.3s var(--easing);
    flex-shrink: 0;
}

.mode-btn.active {
    background: linear-gradient(135deg, rgba(0, 200, 122, 0.1), rgba(0, 200, 122, 0.04));
    color: var(--text-primary);
    border: 1px solid rgba(0, 200, 122, 0.18);
}

.mode-btn.active svg {
    opacity: 1;
    color: var(--accent-color);
}

.mode-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.mode-btn:active {
    transform: scale(0.96);
}

/* ─── Input Group ─── */
.input-group {
    margin-bottom: 18px;
}

label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

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

.currency-symbol {
    position: absolute;
    left: 18px;
    color: var(--accent-color);
    font-weight: 700;
    font-size: 1.05rem;
    pointer-events: none;
    z-index: 1;
}

input[type="text"] {
    width: 100%;
    background-color: var(--input-bg);
    border: 2px solid transparent;
    border-radius: 14px;
    padding: 15px 18px 15px 48px;
    color: var(--text-primary);
    font-size: 1.6rem;
    font-weight: 700;
    font-family: var(--font-family);
    transition: all 0.3s var(--easing);
    position: relative;
    z-index: 1;
}

input[type="text"]::placeholder {
    color: #2e3548;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-color);
    background-color: rgba(0, 200, 122, 0.03);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-ripple {
    position: absolute;
    inset: 0;
    border-radius: 14px;
    pointer-events: none;
    z-index: 0;
}

input[type="text"]:focus~.input-ripple {
    box-shadow: 0 0 24px var(--accent-glow-soft);
}

/* ─── Toggles ─── */
.toggles-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.toggle-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 5px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.025);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: background 0.3s;
}

.toggle-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

.toggle-label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.toggle-label-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.toggle-switch-wrapper {
    position: relative;
    width: 128px;
    height: 34px;
    flex-shrink: 0;
}

.toggle-checkbox {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-switch {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    background-color: var(--input-bg);
    border-radius: 17px;
    width: 100%;
    height: 100%;
    position: relative;
    padding: 3px;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: 0.3s var(--easing);
}

.toggle-switch::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 3px;
    bottom: 3px;
    width: calc(50% - 5px);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 14px;
    transition: all 0.35s var(--easing);
    z-index: 1;
    box-shadow: 0 2px 8px rgba(0, 200, 122, 0.3);
}

.toggle-checkbox:checked+.toggle-switch::before {
    left: calc(50% + 2px);
}

.toggle-option {
    z-index: 2;
    flex: 1;
    text-align: center;
    transition: color 0.3s;
    font-weight: 600;
}

.toggle-checkbox:not(:checked)+.toggle-switch .toggle-option.left {
    color: white;
}

.toggle-checkbox:checked+.toggle-switch .toggle-option.right {
    color: white;
}

.rate-info {
    font-size: 0.7rem;
    color: var(--accent-color);
    font-weight: 700;
    background: rgba(0, 200, 122, 0.08);
    padding: 3px 8px;
    border-radius: 6px;
    border: 1px solid rgba(0, 200, 122, 0.12);
    display: inline-block;
}

/* ─── Result Section ─── */
.result-section {
    text-align: center;
    background: linear-gradient(180deg, rgba(0, 200, 122, 0.06) 0%, rgba(0, 200, 122, 0.01) 100%);
    border-radius: 16px;
    padding: 22px 18px 20px;
    border: 1px solid rgba(0, 200, 122, 0.1);
    position: relative;
    overflow: hidden;
    transition: all 0.3s var(--easing);
}

.clickable-result {
    cursor: pointer;
}

.clickable-result:hover {
    background: linear-gradient(180deg, rgba(0, 200, 122, 0.1) 0%, rgba(0, 200, 122, 0.03) 100%);
    border-color: rgba(0, 200, 122, 0.22);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 200, 122, 0.08);
}

.clickable-result:active {
    transform: translateY(0px);
}

.clickable-result:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.result-label {
    color: var(--text-secondary);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 10px;
    font-weight: 600;
}

.copy-icon {
    opacity: 0;
    transition: opacity 0.2s;
    margin-left: 5px;
    vertical-align: middle;
    color: var(--text-secondary);
}

.clickable-result:hover .copy-icon {
    opacity: 0.5;
}

.result-value {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
    letter-spacing: -1px;
    line-height: 1.1;
}

.result-value.counting {
    color: var(--accent-color);
}

.result-subtext {
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Copy toast */
.copied-toast {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.5);
    background: var(--accent-color);
    color: white;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 6px 18px;
    border-radius: 20px;
    opacity: 0;
    transition: all 0.3s var(--easing);
    pointer-events: none;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 16px rgba(0, 200, 122, 0.4);
    z-index: 10;
}

.copied-toast.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* ─── Tax Calculator Specific ─── */
.tax-info-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
}

.tax-rate-badge {
    background: rgba(0, 200, 122, 0.1);
    color: var(--accent-color);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 8px;
    border: 1px solid rgba(0, 200, 122, 0.15);
    white-space: nowrap;
}

.tax-info-text {
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 500;
}

.tax-breakdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.tax-breakdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}

.tax-breakdown-label {
    font-size: 0.68rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.tax-breakdown-value {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
}

.tax-breakdown-sep {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    margin-top: 18px;
}

.tax-highlight {
    color: var(--accent-color);
}

/* ─── Bottom Tabs ─── */
.bottom-tabs {
    display: flex;
    gap: 3px;
    padding: 3px;
    background: var(--input-bg);
    border-radius: 12px;
    margin-top: 22px;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 10px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s var(--easing);
    font-family: var(--font-family);
    white-space: nowrap;
}

.tab-btn svg {
    opacity: 0.55;
    transition: all 0.3s;
    flex-shrink: 0;
}

.tab-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    background: linear-gradient(135deg, rgba(0, 200, 122, 0.1), rgba(0, 200, 122, 0.04));
    color: var(--text-primary);
    border: 1px solid rgba(0, 200, 122, 0.18);
}

.tab-btn.active svg {
    opacity: 1;
    color: var(--accent-color);
}

/* ─── Footer ─── */
footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.72rem;
    opacity: 0.6;
    font-weight: 500;
}

footer p {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.footer-github {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s var(--easing);
    padding: 4px;
    border-radius: 50%;
}

.footer-github:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

.footer-github svg {
    display: block;
}

/* ─── Result Pop Animation ─── */
@keyframes resultPop {
    0% {
        transform: scale(1);
    }

    30% {
        transform: scale(1.06);
    }

    100% {
        transform: scale(1);
    }
}

.result-value.pop {
    animation: resultPop 0.35s var(--easing);
}

/* ─── Responsive ─── */
@media (max-width: 480px) {
    .container {
        max-width: 100%;
    }

    .calculator-card {
        padding: 18px 16px;
    }

    .result-value {
        font-size: 2.1rem;
    }

    .mode-btn {
        font-size: 0.76rem;
        padding: 9px 6px;
    }

    .toggle-item {
        padding: 4px 12px;
    }

    .toggle-switch-wrapper {
        width: 115px;
    }

    .info-btn {
        top: 12px;
        right: 12px;
        width: 40px;
        height: 40px;
    }

    .modal {
        padding: 24px 20px;
        margin: 10px;
        border-radius: 20px;
    }

    .modal h2 {
        font-size: 1.3rem;
    }

    .modal-description {
        font-size: 0.85rem;
    }

    .modal-github-btn {
        padding: 12px 24px;
        font-size: 0.85rem;
    }

    .modal-icon {
        width: 56px;
        height: 56px;
    }

    .modal-icon svg {
        width: 28px;
        height: 28px;
    }
}

/* Ensure clicks hit the button, not its children */
.mode-btn>*,
.tab-btn>* {
    pointer-events: none;
}