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

:root {
    --mint: #3ECFA0;
    --mint-dark: #2AB085;
    --mint-light: #E8FAF3;
    --charcoal: #1A1A2E;
    --slate: #4A4A68;
    --grey-light: #F4F5F7;
    --grey-mid: #D1D5DB;
    --orange-accent: #FF6B35;
    --font-display: 'Space Mono', monospace;
    --font-body: 'DM Sans', sans-serif;
}

body {
    font-family: var(--font-body);
    background: #FFFFFF;
    color: var(--charcoal);
    line-height: 1.6;
    overflow-x: hidden;
}

/* HEADER */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 40px;
    border-bottom: 2px solid var(--charcoal);
    background: #FFFFFF;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header__brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--charcoal);
}

.header__logo {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    object-fit: cover;
    border: 2px solid var(--charcoal);
}

.header__title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header__title span {
    color: var(--mint-dark);
}

.header__nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.header__link {
    font-family: var(--font-display);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
    color: var(--slate);
    transition: color 0.2s;
}

.header__link:hover {
    color: var(--mint-dark);
}

.header__lang {
    font-family: var(--font-display);
    font-size: 0.7rem;
    padding: 5px 12px;
    border: 2px solid var(--charcoal);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* FORMAT TABS */
.format-tabs {
    display: flex;
    border-bottom: 2px solid var(--charcoal);
    background: var(--grey-light);
}

.format-tab {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 12px 32px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-right: 2px solid var(--charcoal);
    transition: all 0.2s;
    color: var(--slate);
}

.format-tab:hover {
    background: #fff;
}

.format-tab.active {
    background: var(--mint);
    color: var(--charcoal);
}

.format-tab--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.format-tab__badge {
    font-size: 0.55rem;
    padding: 2px 8px;
    background: var(--orange-accent);
    color: #fff;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-left: 8px;
    vertical-align: middle;
}

/* HERO + DROP COMBINED */
.hero-app {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 28px 20px;
    display: flex;
    align-items: center;
    gap: 40px;
}

.hero-app__left {
    flex-shrink: 0;
    text-align: center;
    position: relative;
}

.hero__mascot {
    width: 240px;
    height: 240px;
    border-radius: 20px;
    border: 4px solid var(--charcoal);
    object-fit: cover;
    box-shadow: 8px 8px 0 var(--mint), 16px 16px 0 var(--charcoal);
    animation: mascotFloat 3s ease-in-out infinite;
    position: relative;
    z-index: 2;
}

.hero__mascot-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, var(--mint) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.25;
    z-index: 1;
    animation: glowPulse 2.5s ease-in-out infinite;
}

@keyframes mascotFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(1deg); }
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.2; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.4; transform: translate(-50%, -50%) scale(1.15); }
}

.hero__mascot-label {
    font-family: var(--font-display);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--slate);
    margin-top: 14px;
    position: relative;
    z-index: 2;
}

.hero-app__right {
    flex: 1;
    min-width: 0;
}

.hero__title {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 6px;
}

.hero__title em {
    font-style: normal;
    color: var(--mint-dark);
    position: relative;
}

.hero__title em::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--mint);
    opacity: 0.4;
    z-index: -1;
}

.hero__subtitle {
    font-size: 0.92rem;
    color: var(--slate);
    margin-bottom: 16px;
}

/* MAIN APP AREA */
.app {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 28px 40px;
}

.app__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    gap: 10px;
    flex-wrap: wrap;
}

.app__toolbar-left {
    display: flex;
    gap: 10px;
}

/* BUTTONS */
.btn {
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 700;
    padding: 10px 24px;
    border: 2px solid var(--charcoal);
    border-radius: 6px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn--primary:hover {
    background: var(--mint-dark);
    transform: translateY(-1px);
    box-shadow: 3px 3px 0 var(--charcoal);
}

.btn--primary:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn--secondary {
    background: #fff;
    color: var(--slate);
}

.btn--secondary:hover {
    background: var(--grey-light);
}

.btn--accent {
    background: var(--orange-accent);
    color: #fff;
    border-color: var(--charcoal);
}

.btn--accent:hover {
    background: #e55a28;
    transform: translateY(-1px);
    box-shadow: 3px 3px 0 var(--charcoal);
}

.btn--accent:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* DROPZONE */
.dropzone {
    border: 3px dashed var(--grey-mid);
    border-radius: 12px;
    padding: 30px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s;
    background: #FAFBFC;
    position: relative;
}

.dropzone:hover,
.dropzone.dragover {
    border-color: var(--mint);
    background: var(--mint-light);
}

.dropzone.dragover {
    transform: scale(1.01);
}

.dropzone__icon {
    font-size: 2.8rem;
    margin-bottom: 14px;
    display: block;
}

.dropzone__text {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-bottom: 6px;
}

.dropzone__hint {
    font-size: 0.85rem;
    color: var(--slate);
}

.dropzone__formats {
    margin-top: 14px;
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.dropzone__format-tag {
    font-family: var(--font-display);
    font-size: 0.65rem;
    padding: 3px 10px;
    background: #fff;
    border: 1.5px solid var(--grey-mid);
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--slate);
}

/* FILE CARD */
.file-card {
    display: none;
    align-items: center;
    gap: 16px;
    background: #fff;
    border: 2px solid var(--charcoal);
    border-radius: 10px;
    padding: 18px 22px;
    margin-top: 16px;
    box-shadow: 4px 4px 0 var(--mint);
}

.file-card.visible {
    display: flex;
}

.file-card__icon {
    width: 52px;
    height: 52px;
    border-radius: 10px;
    background: var(--mint-light);
    border: 2px solid var(--mint);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.file-card__info {
    flex: 1;
    min-width: 0;
}

.file-card__name {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-card__meta {
    font-size: 0.8rem;
    color: var(--slate);
    margin-top: 2px;
}

.file-card__remove {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 2px solid var(--grey-mid);
    background: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.15s;
    flex-shrink: 0;
}

.file-card__remove:hover {
    border-color: #e74c3c;
    color: #e74c3c;
    background: #fef2f2;
}

/* PROGRESS */
.progress {
    display: none;
    margin-top: 20px;
}

.progress.visible {
    display: block;
}

.progress__bar-track {
    width: 100%;
    height: 14px;
    background: var(--grey-light);
    border-radius: 7px;
    border: 2px solid var(--charcoal);
    overflow: hidden;
}

.progress__bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--mint), var(--mint-dark));
    border-radius: 5px;
    transition: width 0.3s ease;
}

.progress__label {
    font-family: var(--font-display);
    font-size: 0.75rem;
    margin-top: 8px;
    text-align: center;
    color: var(--slate);
    letter-spacing: 0.5px;
}

/* RESULTS */
.results {
    display: none;
    margin-top: 24px;
    border: 2px solid var(--charcoal);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 5px 5px 0 var(--charcoal);
}

.results.visible {
    display: block;
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.results__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 18px;
    background: var(--charcoal);
    color: #fff;
}

.results__title {
    font-family: var(--font-display);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.results__actions {
    display: flex;
    gap: 8px;
}

.results__action-btn {
    font-family: var(--font-display);
    font-size: 0.68rem;
    padding: 5px 14px;
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.3);
    border-radius: 4px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    transition: all 0.15s;
}

.results__action-btn:hover {
    background: var(--mint);
    color: var(--charcoal);
    border-color: var(--mint);
}

.results__body {
    padding: 24px;
    background: #fff;
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--charcoal);
    min-height: 120px;
    white-space: pre-wrap;
}

.results__stats {
    display: flex;
    gap: 20px;
    padding: 12px 24px;
    background: var(--grey-light);
    border-top: 2px solid var(--charcoal);
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--slate);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* TOAST */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    font-family: var(--font-display);
    font-size: 0.78rem;
    padding: 12px 28px;
    background: var(--charcoal);
    color: #fff;
    border-radius: 8px;
    border: 2px solid var(--mint);
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    z-index: 999;
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    letter-spacing: 0.5px;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* SEO CONTENT */
.content {
    max-width: 820px;
    margin: 0 auto;
    padding: 60px 20px;
}

.content__section {
    margin-bottom: 48px;
}

.content__section-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--mint);
    display: inline-block;
}

.content__text {
    color: var(--slate);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.content__steps {
    list-style: none;
    counter-reset: steps;
}

.content__step {
    counter-increment: steps;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 20px;
}

.content__step::before {
    content: counter(steps);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    width: 40px;
    height: 40px;
    background: var(--mint);
    border: 2px solid var(--charcoal);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.content__step-body h3 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.content__step-body p {
    font-size: 0.88rem;
    color: var(--slate);
}

.content__formats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.content__format-card {
    text-align: center;
    padding: 18px 12px;
    background: var(--grey-light);
    border: 2px solid transparent;
    border-radius: 8px;
    transition: all 0.2s;
}

.content__format-card:hover {
    border-color: var(--mint);
    background: var(--mint-light);
}

.content__format-card strong {
    font-family: var(--font-display);
    font-size: 0.85rem;
    display: block;
    margin-top: 6px;
}

.content__format-card span {
    font-size: 0.78rem;
    color: var(--slate);
}

/* FOOTER */
.footer {
    border-top: 2px solid var(--charcoal);
    padding: 24px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer__copy {
    font-family: var(--font-display);
    font-size: 0.72rem;
    color: var(--slate);
    letter-spacing: 0.5px;
}

.footer__links {
    display: flex;
    gap: 24px;
}

.footer__link {
    font-family: var(--font-display);
    font-size: 0.7rem;
    text-decoration: none;
    color: var(--slate);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    transition: color 0.2s;
}

.footer__link:hover {
    color: var(--mint-dark);
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .header {
        padding: 12px 16px;
    }

    .header__nav {
        gap: 12px;
    }

    .header__link {
        display: none;
    }

    .format-tab {
        padding: 10px 16px;
        font-size: 0.68rem;
    }

    .hero-app {
        flex-direction: column;
        padding: 20px 16px 12px;
        gap: 20px;
        text-align: center;
    }

    .hero__mascot {
        width: 160px;
        height: 160px;
        box-shadow: 6px 6px 0 var(--mint), 12px 12px 0 var(--charcoal);
    }

    .hero__mascot-glow {
        width: 160px;
        height: 160px;
    }

    .dropzone {
        padding: 24px 16px;
    }

    .app {
        padding: 0 16px 32px;
    }

    .file-card {
        flex-wrap: wrap;
    }

    .results__stats {
        flex-wrap: wrap;
        gap: 10px;
    }

    .footer {
        padding: 20px 16px;
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero__mascot {
        width: 130px;
        height: 130px;
    }

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

    .app__toolbar-left {
        justify-content: center;
    }

    .btn {
        justify-content: center;
        width: 100%;
    }
}

/* 404 ERROR PAGE */
.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    padding: 40px 20px;
    text-align: center;
}

.error-page__mascot {
    width: 160px;
    height: 160px;
    border-radius: 20px;
    border: 4px solid var(--charcoal);
    object-fit: cover;
    box-shadow: 6px 6px 0 var(--mint);
    opacity: 0.7;
}

.error-page__code {
    font-family: var(--font-display);
    font-size: 6rem;
    font-weight: 700;
    color: var(--mint);
    line-height: 1;
    margin-top: 24px;
    letter-spacing: -4px;
}

.error-page__heading {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--charcoal);
    margin-top: 8px;
}

.error-page__text {
    font-size: 0.95rem;
    color: var(--slate);
    margin-top: 8px;
    max-width: 400px;
}

.error-page__btn {
    margin-top: 24px;
}

/* MODAL */
.modal {
    display: none;
}

.modal.is-open {
    display: block;
}

.modal__overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 20px;
}

.modal__container {
    background: #fff;
    border: 2px solid var(--charcoal);
    border-radius: 12px;
    width: 100%;
    max-width: 580px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: 8px 8px 0 var(--charcoal);
    animation: modalSlideUp 0.3s ease;
}

@keyframes modalSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 2px solid var(--charcoal);
    background: var(--mint);
    border-radius: 10px 10px 0 0;
}

.modal__title {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--charcoal);
}

.modal__close {
    width: 30px;
    height: 30px;
    border: 2px solid var(--charcoal);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: all 0.15s;
    flex-shrink: 0;
}

.modal__close:hover {
    background: var(--charcoal);
    color: #fff;
}

.modal__content {
    padding: 24px;
    overflow-y: auto;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--slate);
}

.modal__content p {
    margin-bottom: 12px;
}

.modal__content p:last-child {
    margin-bottom: 0;
}

.modal__content strong {
    color: var(--charcoal);
}

.modal__content a {
    color: var(--mint-dark);
    text-decoration: none;
}

.modal__content a:hover {
    text-decoration: underline;
}

.modal__email {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--charcoal);
    text-align: center;
    padding: 20px;
    background: var(--grey-light);
    border: 2px solid var(--grey-mid);
    border-radius: 8px;
    letter-spacing: 1px;
}

.modal__email span {
    color: var(--mint-dark);
}

.modal__footer {
    padding: 14px 24px;
    border-top: 2px solid var(--charcoal);
    display: flex;
    justify-content: flex-end;
}

.modal__btn {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 8px 20px;
    background: var(--charcoal);
    color: #fff;
    border: 2px solid var(--charcoal);
    border-radius: 6px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.15s;
}

.modal__btn:hover {
    background: var(--mint-dark);
    border-color: var(--mint-dark);
}

@media (max-width: 480px) {
    .modal__container {
        max-height: 90vh;
    }

    .modal__header {
        padding: 14px 16px;
    }

    .modal__content {
        padding: 16px;
    }

    .modal__footer {
        padding: 12px 16px;
    }
}