:root {
    --bg: #f4f5fb;
    --bg-soft: #eef2ff;
    --surface: #ffffff;
    --border: #dfe4f3;
    --divider: #e5e7f5;
    --text: #111827;
    --muted: #6b7280;
    --accent: #3b82f6;
    --accent-soft: rgba(59, 130, 246, 0.08);
    --accent-strong: #2563eb;
    --shadow-soft: 0 14px 35px rgba(15, 23, 42, 0.12);
    font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
    color: var(--text);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(to bottom, #f9fafb 0%, #f4f5fb 40%, #edf2ff 100%);
    display: flex;
    align-items: stretch;
    justify-content: center;
    padding: 2.5rem 1.5rem;
}

.page {
    width: min(1160px, 100%);
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 1.75rem;
}

.page--topnav {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.sidebar {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border);
    padding: 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    backdrop-filter: blur(18px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.brand-mark {
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 0.9rem;
    background: radial-gradient(circle at 30% 0%, #f9fafb 0%, #3b82f6 45%, #6366f1 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    color: #f9fafb;
    box-shadow: 0 14px 30px rgba(88, 80, 236, 0.4);
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.brand-title {
    font-weight: 600;
    letter-spacing: 0.03em;
    font-size: 0.98rem;
    text-transform: uppercase;
}

.brand-subtitle {
    font-size: 0.8rem;
    color: var(--muted);
}

.nav {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}

.topbar {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border);
    padding: 1.1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    backdrop-filter: blur(18px);
}

.nav--top {
    margin-top: 0;
    margin-left: auto;
}

.nav-item {
    border: none;
    background: transparent;
    padding: 0.6rem 0.9rem;
    border-radius: 0.75rem;
    text-align: left;
    font-size: 0.92rem;
    color: var(--muted);
    display: flex;
    align-items: center;
    gap: 0.45rem;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease, transform 0.12s ease;
}

.nav-item::before {
    content: "";
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 999px;
    background: transparent;
    border: 1px solid transparent;
}

.nav-item:hover {
    background: rgba(99, 102, 241, 0.06);
    color: var(--text);
    transform: translateX(1px);
}

.nav-item.active {
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-weight: 500;
}

.nav-item.active::before {
    background: var(--accent);
    border-color: rgba(129, 140, 248, 0.4);
}

.nav-footer {
    margin-top: auto;
    padding-top: 0.85rem;
    border-top: 1px dashed var(--divider);
    font-size: 0.78rem;
    color: var(--muted);
}

.content {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.card {
    background: var(--surface);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border);
}

.card--main {
    padding: 2rem 2.25rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

header h1 {
    margin: 0;
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 1.8rem;
    letter-spacing: -0.01em;
}

header p {
    color: var(--muted);
    margin-top: 0.45rem;
    font-size: 0.95rem;
}

main {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.config label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.config input {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 0.9rem;
    border: 1px solid var(--border);
    background: #f9fafb;
    font-size: 0.9rem;
}

.config input:focus-visible {
    outline: 2px solid rgba(129, 140, 248, 0.55);
    outline-offset: 1px;
    background: #ffffff;
}

.helper-text {
    margin: 0.45rem 0 0;
    font-size: 0.82rem;
    color: var(--muted);
}

.controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.9rem;
    align-items: flex-end;
}

.control label {
    font-weight: 600;
    margin-bottom: 0.35rem;
    display: inline-block;
    font-size: 0.9rem;
}

.control select {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 0.9rem;
    border: 1px solid var(--border);
    background: #f9fafb;
    font-size: 0.9rem;
}

button {
    font-family: inherit;
}

#swapBtn {
    border: none;
    border-radius: 999px;
    width: 3rem;
    height: 3rem;
    background: radial-gradient(circle at 30% 0%, #eef2ff 0%, #3b82f6 40%, #6366f1 100%);
    box-shadow: 0 12px 26px rgba(37, 99, 235, 0.5);
    color: #f9fafb;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.16s ease, box-shadow 0.16s ease, filter 0.16s ease;
}

#swapBtn:hover {
    transform: translateY(-1px) scale(1.02);
    filter: brightness(1.02);
    box-shadow: 0 18px 36px rgba(88, 80, 236, 0.55);
}

.secondary {
    background: #f3f4ff;
    color: var(--accent-strong);
}

.io {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}

.io-block label {
    font-weight: 600;
    margin-bottom: 0.35rem;
    display: inline-block;
    font-size: 0.9rem;
}

.io-block {
    position: relative;
    display: flex;
    flex-direction: column;
}

.io-block textarea {
    width: 100%;
    padding: 0.95rem 1rem;
    border-radius: 0.95rem;
    border: 1px solid var(--border);
    min-height: 210px;
    font-size: 0.95rem;
    background: #f9fafb;
    resize: vertical;
}

.io-block textarea:focus-visible {
    outline: 2px solid rgba(129, 140, 248, 0.55);
    outline-offset: 1px;
    background: #ffffff;
}

.io-block textarea::placeholder {
    color: #9ca3af;
    opacity: 0.7;
    line-height: 1.6;
}

.empty-state {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    pointer-events: none;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    opacity: 0.6;
    transition: opacity 0.3s ease;
    margin-top: 2.5rem;
}

.empty-state-icon {
    font-size: 3rem;
    line-height: 1;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.empty-state-text {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.empty-state-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.empty-state-subtitle {
    font-size: 0.9rem;
    color: var(--muted);
    margin: 0;
}

.io-block textarea:focus + .empty-state,
.io-block textarea:not(:placeholder-shown) + .empty-state {
    opacity: 0;
    pointer-events: none;
}

.actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: flex-start;
}

#translateBtn {
    padding: 0.9rem 2.4rem;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563eb, #6366f1);
    color: #ffffff;
    font-size: 0.98rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 14px 30px rgba(88, 80, 236, 0.55);
    transition: transform 0.16s ease, box-shadow 0.16s ease, filter 0.16s ease;
}

#translateBtn:hover:not(:disabled) {
    transform: translateY(-1px);
    filter: brightness(1.02);
    box-shadow: 0 20px 40px rgba(79, 70, 229, 0.6);
}

#translateBtn:disabled {
    opacity: 0.75;
    cursor: default;
    box-shadow: 0 8px 18px rgba(148, 163, 184, 0.4);
}

#status {
    font-size: 0.9rem;
    color: var(--muted);
}

.card-footer {
    padding-top: 0.75rem;
    margin-top: 0.25rem;
    border-top: 1px dashed var(--divider);
    color: var(--muted);
    font-size: 0.78rem;
}

.info-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.85rem;
}

.info-card {
    background: rgba(255, 255, 255, 0.96);
    border-radius: 1.1rem;
    border: 1px solid var(--border);
    padding: 1.3rem 1.4rem;
    box-shadow: 0 10px 26px rgba(15, 23, 42, 0.07);
    font-size: 0.9rem;
    color: var(--muted);
}

.info-card h2 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    color: var(--text);
    font-family: "Georgia", "Times New Roman", serif;
}

.info-card p {
    margin-top: 0.4rem;
    line-height: 1.5;
}

.info-card ul {
    padding-left: 1.2rem;
    margin: 0.3rem 0 0.5rem;
}

.info-card li {
    margin-bottom: 0.2rem;
}

.info-card a {
    color: var(--accent-strong);
    text-decoration: none;
}

.info-card a:hover {
    text-decoration: underline;
}

.ack {
    margin-top: 0.6rem;
    padding: 0.6rem 0.75rem;
    border-radius: 0.75rem;
    background: #f9fafb;
    border: 1px dashed var(--divider);
}

code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.82rem;
    padding: 0.1rem 0.3rem;
    border-radius: 0.25rem;
    background: #f3f4ff;
}

.site-footer {
    width: 100%;
    margin: 2rem 0 0;
    padding: 1.5rem 1.5rem 2rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.88rem;
    border-top: 1px solid var(--divider);
}

.site-footer p {
    margin: 0.4rem 0;
    line-height: 1.6;
}

.site-footer a {
    color: var(--accent-strong);
    text-decoration: none;
    font-weight: 500;
}

.site-footer a:hover {
    text-decoration: underline;
}

@media (max-width: 900px) {
    body {
        padding: 1.5rem 1rem;
    }

    .page {
        grid-template-columns: 1fr;
    }

    .sidebar {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        padding: 1rem 1.25rem;
        gap: 1.25rem;
    }

    .nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.4rem;
        margin-top: 0;
        margin-left: auto;
    }

    .nav-item {
        font-size: 0.86rem;
        padding-inline: 0.7rem;
    }

    .nav-footer {
        display: none;
    }
}

@media (max-width: 640px) {
    body {
        padding: 1rem 0.75rem;
    }

    .card--main {
        padding: 1.2rem 1.15rem 1.1rem;
    }

    header h1 {
        font-size: 1.35rem;
    }

    header p {
        font-size: 0.9rem;
    }

    .contact-form {
        gap: 1.3rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 1.3rem;
    }

    .controls {
        grid-template-columns: 1fr;
    }

    #swapBtn {
        width: 100%;
        justify-content: center;
    }

    .actions {
        flex-direction: column;
        align-items: stretch;
    }

    #translateBtn {
        width: 100%;
        justify-content: center;
        text-align: center;
    }

    .io-block textarea {
        min-height: 160px;
    }

    .empty-state {
        padding: 1.5rem;
        margin-top: 2rem;
    }

    .empty-state-icon {
        font-size: 2.5rem;
    }

    .empty-state-title {
        font-size: 1rem;
    }

    .empty-state-subtitle {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .page {
        gap: 1rem;
    }

    .sidebar {
        padding: 0.85rem 0.9rem;
        border-radius: 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .brand-mark {
        width: 2.1rem;
        height: 2.1rem;
        font-size: 0.85rem;
    }

    .brand-title {
        font-size: 0.9rem;
    }

    .brand-subtitle {
        font-size: 0.75rem;
    }

    .nav {
        width: 100%;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 0.15rem;
    }

    .nav-item {
        padding-inline: 0.55rem;
        font-size: 0.8rem;
        white-space: nowrap;
    }

    .info-card {
        padding: 1.05rem 1.1rem;
        font-size: 0.86rem;
    }

    .site-footer {
        padding: 1.25rem 1rem 1.5rem;
        font-size: 0.82rem;
    }
}

/* Contact Form Styles */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    width: 100%;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
}

/* Two-column layout for name and email on larger screens */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group label {
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--text);
    letter-spacing: 0.01em;
    margin-bottom: 0.1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.15rem;
    border-radius: 1rem;
    border: 1.5px solid var(--border);
    background: #fafbfc;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #9ca3af;
    opacity: 0.7;
}

.form-group input:hover,
.form-group textarea:hover {
    border-color: #c7d2fe;
    background: #ffffff;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.08);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1), 0 4px 12px rgba(59, 130, 246, 0.15);
    transform: translateY(-1px);
}

.form-group textarea {
    resize: vertical;
    min-height: 160px;
    line-height: 1.6;
    padding: 1.1rem 1.15rem;
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    justify-content: flex-start;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

#submitBtn {
    padding: 1rem 2.8rem;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 50%, #6366f1 100%);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.4), 0 4px 10px rgba(59, 130, 246, 0.2);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

#submitBtn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

#submitBtn:hover:not(:disabled)::before {
    left: 100%;
}

#submitBtn:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.02);
    filter: brightness(1.05);
    box-shadow: 0 15px 35px rgba(59, 130, 246, 0.5), 0 6px 15px rgba(59, 130, 246, 0.3);
}

#submitBtn:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

#submitBtn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

#formStatus {
    font-size: 0.92rem;
    color: var(--muted);
    line-height: 1.5;
    transition: all 0.3s ease;
    min-height: 1.5rem;
    display: flex;
    align-items: center;
}

#formStatus.success {
    color: #059669;
    font-weight: 500;
    animation: slideIn 0.3s ease;
}

#formStatus.error {
    color: #dc2626;
    font-weight: 500;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Contact Form Styles */
@media (max-width: 900px) {
    .contact-form {
        gap: 1.5rem;
    }

    .form-row {
        gap: 1.25rem;
    }

    .form-group input,
    .form-group textarea {
        padding: 0.95rem 1.1rem;
        font-size: 0.93rem;
    }

    .form-group textarea {
        min-height: 140px;
    }

    #submitBtn {
        padding: 0.95rem 2.4rem;
        font-size: 0.96rem;
    }
}

@media (max-width: 640px) {
    .contact-form {
        gap: 1.4rem;
        width: 100%;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 1.4rem;
    }

    .form-group {
        gap: 0.45rem;
    }

    .form-group label {
        font-size: 0.9rem;
    }

    .form-group input,
    .form-group textarea {
        padding: 0.9rem 1rem;
        border-radius: 0.85rem;
        font-size: 0.9rem;
    }

    .form-group textarea {
        min-height: 130px;
        padding: 1rem;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
        margin-top: 0.5rem;
    }

    #submitBtn {
        width: 100%;
        padding: 1rem 2rem;
        justify-content: center;
        text-align: center;
    }

    #formStatus {
        font-size: 0.88rem;
        text-align: center;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .contact-form {
        gap: 1.25rem;
    }

    .form-group input,
    .form-group textarea {
        padding: 0.85rem 0.95rem;
        font-size: 0.88rem;
    }

    .form-group textarea {
        min-height: 120px;
    }

    #submitBtn {
        padding: 0.9rem 1.8rem;
        font-size: 0.94rem;
    }
}