:root {
    --color-primary: #0f9073;
    --color-primary-dark: #0a7260;
    --color-primary-light: #e3f6f1;
    --color-bg: #f3f7f9;
    --color-navy: #061622;
    --color-navy-light: #0b2538;
    --color-text: #09151f;
    --color-muted: #5b6b74;
    --color-border: #dfe8ea;
    --color-danger: #c0392b;
    --color-danger-bg: #fdeceb;
    --color-success-bg: #e6f6ee;
    --color-success: #157347;
    --font-display: 'Syne', sans-serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-card: 0 10px 30px -12px rgba(6, 22, 34, 0.18);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    display: flex;
    flex-direction: column;
}

/* Navbar */

.navbar {
    background: linear-gradient(180deg, #0d2235 0%, var(--color-navy) 100%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.navbar__inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #fff;
    min-width: 0;
}

.brand__logo {
    width: 38px;
    height: 38px;
    object-fit: contain;
    flex-shrink: 0;
}

.brand__text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    min-width: 0;
}

.brand__text strong {
    font-family: var(--font-display);
    font-size: 15px;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.brand__text small {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.55);
    white-space: nowrap;
}

.navbar__tag {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary-light);
    background: rgba(15, 144, 115, 0.18);
    border: 1px solid rgba(15, 144, 115, 0.35);
    padding: 6px 12px;
    border-radius: 999px;
    white-space: nowrap;
    flex-shrink: 0;
}

/* Layout */

.wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
    padding: 40px 20px 24px;
}

main {
    flex: 1;
}

.page-intro {
    text-align: center;
    margin-bottom: 28px;
}

.page-intro h1 {
    font-family: var(--font-display);
    font-size: clamp(24px, 4vw, 32px);
    margin: 0 0 10px;
}

.page-intro p {
    color: var(--color-muted);
    margin: 0;
    font-size: 15px;
    line-height: 1.55;
}

.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 24px;
    margin-bottom: 24px;
}

/* Drop zone */

.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    background: #fbfdfd;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color .15s, background .15s;
}

.drop-zone:hover {
    border-color: var(--color-primary);
}

.drop-zone.is-dragover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.drop-zone__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    margin-bottom: 14px;
}

.drop-zone__cta {
    margin: 0;
    font-size: 15px;
}

.drop-zone__prompt .hint {
    color: var(--color-muted);
    font-size: 13px;
    margin: 6px 0 0;
}

.drop-zone__file[hidden] {
    display: none;
}

.drop-zone__file {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.file-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--color-primary);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.03em;
    flex-shrink: 0;
}

.file-name {
    font-weight: 600;
    word-break: break-all;
}

.link-btn {
    background: none;
    border: none;
    color: var(--color-primary-dark);
    font-weight: 600;
    cursor: pointer;
    padding: 0;
    font-size: 14px;
    text-decoration: underline;
}

/* Buttons */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    margin-top: 18px;
    padding: 15px 20px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: #fff;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: background .15s, transform .1s;
}

.btn:disabled {
    background: #c7d3d6;
    cursor: not-allowed;
}

.btn:not(:disabled):hover {
    background: var(--color-primary-dark);
}

.btn:not(:disabled):active {
    transform: scale(0.99);
}

/* Status */

.status {
    margin-top: 16px;
    padding: 13px 15px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
}

.status--info { background: var(--color-primary-light); color: var(--color-primary-dark); }
.status--error { background: var(--color-danger-bg); color: var(--color-danger); }
.status--success { background: var(--color-success-bg); color: var(--color-success); }

/* Result */

.result h2 {
    font-family: var(--font-display);
    font-size: 18px;
    margin: 0 0 14px;
}

.preview-frame {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #f5f7f8;
}

#preview {
    width: 100%;
    height: 480px;
    border: none;
    display: block;
}

.btn--primary {
    background: var(--color-navy);
}

.btn--primary:hover {
    background: #0b2538;
}

/* Footer */

.footer {
    text-align: center;
    padding: 20px 0 10px;
    color: var(--color-muted);
    font-size: 12px;
}

/* Responsive */

@media (max-width: 480px) {
    .wrap { padding: 28px 14px 20px; }
    .card { padding: 18px; }
    .navbar__tag { display: none; }
    .drop-zone { padding: 30px 14px; }
    #preview { height: 380px; }
}