:root {
    --black: #1c1c1c;
    --white: #e5e5e5;
    --gray-light: #d4d4d4;
    --gray-mid: #6b7280;
    --gray-dark: #1f2937;
    --border: #a8a8a8;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: all 0.2s ease;
}

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

html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    min-height: 100vh;
    padding: clamp(1rem, 3vw, 2rem);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* ========================================
   HEADER
   ======================================== */
header {
    margin-bottom: clamp(2rem, 4vw, 3rem);
    text-align: center;
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

h1 i {
    margin-right: 0.5rem;
}

header p {
    font-size: clamp(0.875rem, 2vw, 1rem);
    color: var(--gray-dark);
    max-width: 600px;
    margin: 0 auto;
}

nav {
    margin: 1.5rem 0;
}

nav a {
    color: var(--black);
    text-decoration: none;
    font-weight: 600;
    font-size: clamp(0.875rem, 2vw, 1rem);
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

nav a:hover {
    border-bottom-color: var(--black);
}

/* Header per pagine info */
header.info-header {
    border-bottom: 2px solid var(--black);
    padding-bottom: 1.5rem;
}

/* ========================================
   TABS (index.html)
   ======================================== */
.tabs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.tab {
    background: var(--white);
    color: var(--black);
    border: 2px solid var(--black);
    border-radius: var(--radius);
    padding: clamp(0.75rem, 2vw, 1rem) clamp(1rem, 3vw, 1.5rem);
    font-size: clamp(0.875rem, 2vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.tab:hover:not(.active) {
    background: var(--gray-light);
}

.tab.active {
    background: var(--black);
    color: var(--white);
}

/* ========================================
   FORM ELEMENTS
   ======================================== */
textarea,
input[type="password"],
input[type="text"],
select {
    width: 100%;
    padding: clamp(0.75rem, 2vw, 1rem);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: clamp(0.875rem, 2vw, 1rem);
    transition: var(--transition);
    background: var(--white);
    color: var(--black);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%231c1c1c' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right clamp(0.75rem, 2vw, 1rem) center;
    padding-right: 2.5rem;
}

textarea:focus,
input:focus,
select:focus {
    outline: none;
    border-color: var(--black);
}

textarea {
    min-height: clamp(180px, 3.2vh, 220px);
    resize: vertical;
}

textarea[readonly] {
    background: var(--gray-light);
    cursor: not-allowed;
}

/* ========================================
   DROP ZONE
   ======================================== */
.drop-zone {
    border: 2px dashed var(--border);
    padding: clamp(2rem, 5vw, 3rem) clamp(1rem, 3vw, 1.5rem);
    text-align: center;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    background: var(--gray-light);
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--black);
    background: #eeeeee;
}

.drop-zone i {
    color: var(--gray-mid);
    font-size: clamp(2.5rem, 6vw, 3rem);
    margin-bottom: 1rem;
    display: block;
}

.drop-zone small {
    display: block;
    margin-top: 0.75rem;
    color: var(--gray-dark);
    font-size: clamp(0.75rem, 2vw, 0.875rem);
}

.browse {
    color: var(--black);
    font-weight: 600;
    cursor: pointer;
    text-decoration: underline;
}

/* ========================================
   FILE INFO
   ======================================== */
#file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: var(--gray-light);
    padding: clamp(0.75rem, 2vw, 1rem) clamp(1rem, 3vw, 1.25rem);
    border-radius: var(--radius);
    margin: 1rem 0;
    border: 1px solid var(--border);
}

#file-info span {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#file-info button {
    background: none;
    border: none;
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    cursor: pointer;
    color: var(--gray-mid);
    transition: var(--transition);
    padding: 0.25rem;
    flex-shrink: 0;
}

#file-info button:hover {
    color: var(--black);
}

/* ========================================
   PASSWORD WRAPPER
   ======================================== */
.password-wrapper {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

#password {
    flex: 1;
}

#toggle-pass {
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: clamp(0.75rem, 2vw, 1rem);
    cursor: pointer;
    color: var(--gray-dark);
    transition: var(--transition);
    min-width: 48px;
}

#toggle-pass:hover {
    border-color: var(--black);
    color: var(--black);
}

/* ========================================
   VERSION SECTION
   ======================================== */
#version-section {
    margin: 1.5rem 0;
}

#version-section label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--black);
}

/* ========================================
   ACTION SECTION
   ======================================== */
#action-section {
    display: flex;
    justify-content: center;
    gap: clamp(0.75rem, 2vw, 1rem);
    margin: 2rem 0;
    flex-wrap: wrap;
}

button.primary {
    background: var(--black);
    color: var(--white);
    border: none;
    padding: clamp(0.75rem, 2vw, 0.875rem) clamp(1.5rem, 4vw, 2rem);
    font-size: clamp(0.875rem, 2vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button.primary:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

button.primary:active {
    transform: translateY(0);
}

button.primary i {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
}

/* ========================================
   OUTPUT ACTIONS
   ======================================== */
.output-actions {
    margin-top: 1rem;
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.output-actions button {
    background: var(--white);
    border: 2px solid var(--black);
    color: var(--black);
    padding: clamp(0.5rem, 1.5vw, 0.625rem) clamp(1rem, 2.5vw, 1.25rem);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: clamp(0.8125rem, 2vw, 0.875rem);
    font-weight: 600;
    transition: var(--transition);
}

.output-actions button:hover {
    background: var(--black);
    color: var(--white);
}

/* ========================================
   MAIN.INFO – PAGINE INFORMATIVE
   ======================================== */
main.info {
    background: var(--white);
    padding: clamp(1.5rem, 3vw, 2rem);
    border-radius: var(--radius);
    border: 2px solid var(--black);
    box-shadow: var(--shadow-md);
    margin-bottom: clamp(2rem, 4vw, 3rem);
}

main.info h2 {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 700;
    margin: clamp(1.5rem, 3vw, 2rem) 0 clamp(1rem, 2vw, 1.5rem);
    letter-spacing: -0.01em;
    position: relative;
}

main.info h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -0.5rem;
    width: 60px;
    height: 3px;
    background: var(--black);
    border-radius: 2px;
}

main.info h3 {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    font-weight: 600;
    margin: clamp(1.5rem, 3vw, 2rem) 0 1rem;
    color: var(--gray-dark);
}

main.info p {
    margin-bottom: 1rem;
    font-size: clamp(0.9375rem, 3.2vw, 1rem);
}

main.info p strong {
    color: var(--black);
    font-weight: 700;
}

/* Liste */
main.info ul,
main.info ol {
    margin: 1.25rem 0;
    padding-left: 1.5rem;
}

main.info ul li,
main.info ol li {
    margin-bottom: 0.75rem;
    font-size: clamp(0.9375rem, 3.2vw, 1rem);
    position: relative;
}

main.info ul li strong,
main.info ol li strong {
    color: var(--black);
    font-weight: 600;
}

/* Liste numerate */
main.info ol {
    counter-reset: list-counter;
    list-style: none;
    padding-left: 0;
}

main.info ol li {
    counter-increment: list-counter;
    padding-left: 2.5rem;
}

main.info ol li::before {
    content: counter(list-counter);
    position: absolute;
    left: 0;
    top: 0;
    background: var(--black);
    color: var(--white);
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    line-height: 1;
}

/* Liste puntate */
main.info ul {
    list-style: none;
}

main.info ul li::before {
    content: '●';
    color: var(--black);
    font-weight: bold;
    position: absolute;
    left: -1.25rem;
    top: 0.1em;
}

main.info small {
    display: block;
    margin-top: 1.5rem;
    font-size: clamp(0.8125rem, 2vw, 0.875rem);
    color: var(--gray-dark);
    font-style: italic;
    line-height: 1.5;
}

/* ========================================
   PWA INSTALL BUTTON
   ======================================== */
#pwa-install-container {
    position: fixed;
    top: clamp(1rem, 2vw, 1.5rem);
    right: clamp(1rem, 2vw, 1.5rem);
    z-index: 100;
}

#pwa-install-btn {
    background: var(--black);
    color: var(--white);
    border: none;
    padding: clamp(0.625rem, 1.5vw, 0.75rem) clamp(1rem, 2.5vw, 1.25rem);
    border-radius: var(--radius);
    font-size: clamp(0.8125rem, 2vw, 0.9375rem);
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

#pwa-install-btn:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

#pwa-install-btn i {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
}

/* ========================================
   TOAST
   ======================================== */
.toast {
    position: fixed;
    top: clamp(1rem, 2vw, 1.5rem);
    right: clamp(1rem, 2vw, 1.5rem);
    z-index: 9999;
    padding: clamp(0.875rem, 2vw, 1rem) clamp(1.25rem, 3vw, 1.5rem);
    border-radius: var(--radius);
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    min-width: min(280px, calc(100vw - 2rem));
    max-width: 400px;
    transform: translateX(120%);
    transition: transform 0.4s ease;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background: var(--white);
    color: var(--black);
    border: 2px solid var(--black);
}

.toast.error {
    background: var(--black);
    color: var(--white);
    border: 2px solid var(--black);
}

/* ========================================
   BUTTONS (Donation, Install)
   ======================================== */
.donation-button,
.install-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--black);
    color: var(--white);
    padding: clamp(0.75rem, 2vw, 0.875rem) clamp(1.25rem, 3vw, 1.5rem);
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: clamp(0.875rem, 2vw, 1rem);
    transition: var(--transition);
}

.donation-button:hover,
.install-button:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.donation-button i {
    color: var(--white);
}

/* ========================================
   FOOTER
   ======================================== */
footer {
    margin-top: clamp(3rem, 6vw, 5rem);
    padding: clamp(1.5rem, 3vw, 2rem) 0;
    text-align: center;
    font-size: clamp(0.8125rem, 2vw, 0.875rem);
    border-top: 2px solid var(--black);
}

footer a {
    color: var(--black);
    text-decoration: none;
    font-weight: 600;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

footer a:hover {
    border-bottom-color: var(--black);
}

footer small {
    display: block;
    margin-top: 1rem;
    color: var(--gray-dark);
}

footer .footer-buttons {
    margin: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

/* ========================================
   UTILITIES
   ======================================== */
.hidden {
    display: none !important;
}
/* ========================================
   FINNISH BLUE TEXT (Salaus meaning)
   ======================================== */
.finnish-blue {
    color: #0055A4;
    font-weight: 700;
}
/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .tabs {
        grid-template-columns: 1fr;
    }

    .output-actions {
        justify-content: stretch;
    }

    .output-actions button {
        flex: 1;
    }

    .password-wrapper {
        flex-direction: column;
    }

    #toggle-pass {
        width: 100%;
    }

    main.info {
        padding: clamp(1rem, 2.5vw, 1.5rem);
    }

    main.info ol li {
        padding-left: 3.25rem;
    }

    main.info ol li::before {
        width: 1.5rem;
        height: 1.5rem;
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    #action-section {
        flex-direction: column;
    }

    button.primary {
        width: 100%;
    }

    footer .footer-buttons {
        width: 100%;
    }

    .donation-button,
    .install-button {
        width: 100%;
    }

    .toast {
        left: 1rem;
        right: 1rem;
    }

    main.info h2 {
        font-size: 1.5rem;
    }

    main.info h3 {
        font-size: 1.125rem;
    }

    main.info ol li::before {
        width: 1.4rem;
        height: 1.4rem;
        font-size: 0.75rem;
    }
}

@media (max-width: 360px) {
    body {
        padding: 0.75rem;
    }

    .tab {
        font-size: 0.875rem;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 900px;
    }
}