/* variables tema claro/oscuro */
:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --text: #1a2639;
    --text-light: #2c3e50;
    --border: #d0d9e6;
    --accent: #3b6ea5;
    --accent-light: #6c91b9;
    --error: #c44545;
    --success: #2e7d5e;
    --shadow: 0 10px 25px -5px rgba(0,0,0,0.1);
    --font: 'Inter', sans-serif;
}

.dark {
    --bg: #121826;
    --surface: #1e2638;
    --text: #e3e9f2;
    --text-light: #b0c0d4;
    --border: #2f3a4f;
    --accent: #5f8bc9;
    --accent-light: #7aa5da;
    --error: #e67a7a;
    --success: #4e9e7a;
    --shadow: 0 10px 25px -5px rgba(0,0,0,0.5);
}

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    transition: background 0.2s, color 0.2s;
    padding: 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    max-width: 1200px;
    margin: 0 auto 2rem;
    width: 100%;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

h1 {
    font-weight: 500;
    font-size: 2.2rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 3rem;
    width: 3rem;
    height: 3rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
    box-shadow: var(--shadow);
    transition: 0.2s;
}

#theme-toggle:hover {
    transform: scale(1.05);
    border-color: var(--accent);
}

.subtitle {
    color: var(--text-light);
    font-size: 1rem;
    margin-top: 0.5rem;
}

/* Pestañas */
.tabs {
    max-width: 1200px;
    margin: 0 auto 1.5rem;
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-light);
    cursor: pointer;
    border-radius: 2rem 2rem 0 0;
    transition: 0.2s;
    position: relative;
}

.tab-btn:hover {
    color: var(--accent);
}

.tab-btn.active {
    color: var(--accent);
    background: var(--surface);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -0.7rem;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    border-radius: 3px 3px 0 0;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    flex: 1;
}

.cipher-card {
    background: var(--surface);
    border-radius: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.2s;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.cipher-card:hover {
    transform: translateY(-2px);
}

.card-header {
    padding: 1.5rem 2rem;
    background: var(--surface);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    user-select: none;
}

.card-header h2 {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--accent);
    margin: 0;
}

.toggle-icon {
    font-size: 1.2rem;
    color: var(--accent);
    transition: transform 0.3s ease;
}

.card-content {
    transition: max-height 0.3s ease-out, padding 0.3s ease;
    padding: 2rem;
}

.card-content.collapsed {
    max-height: 0;
    padding: 0 2rem;
    overflow: hidden;
}

/* Secciones colapsables dentro de cada tarjeta */
.collapsible-section {
    margin: 1rem 0;
    border: 1px solid var(--border);
    border-radius: 1rem;
    overflow: hidden;
}

.section-header {
    background: var(--bg);
    padding: 1rem 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    color: var(--text);
    border-bottom: 1px solid var(--border);
    user-select: none;
}

.section-header:hover {
    background: var(--surface);
}

.section-content {
    transition: max-height 0.3s ease-out, padding 0.3s ease;
    padding: 1.5rem;
    background: var(--surface);
}

.section-content.collapsed {
    max-height: 0;
    padding: 0 1.5rem;
    overflow: hidden;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

label {
    font-weight: 500;
    color: var(--text-light);
}

textarea, input[type="text"], input[type="number"] {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 1.2rem;
    padding: 1.2rem;
    font-family: var(--font);
    font-size: 0.95rem;
    color: var(--text);
    resize: vertical;
    transition: 0.2s;
    width: 100%;
}

input[type="text"], input[type="number"] {
    padding: 0.8rem 1.2rem;
}

textarea:focus, input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 110, 165, 0.2);
}

.button-group {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.btn {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.8rem 1.5rem;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text);
    cursor: pointer;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.btn.primary {
    background: var(--accent);
    color: white;
    border: none;
}

.btn.primary:hover {
    background: var(--accent-light);
}

.btn.example {
    background: transparent;
    border: 1px dashed var(--accent);
    color: var(--accent);
}

.btn.example:hover {
    background: var(--accent);
    color: white;
}

.results {
    margin-top: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.ic-box {
    background: var(--bg);
    padding: 0.8rem 1.2rem;
    border-radius: 2rem;
    font-size: 1.1rem;
    font-weight: 500;
    border: 1px solid var(--border);
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.ic-interpretation {
    font-size: 0.9rem;
    font-weight: normal;
    padding: 0.2rem 0.8rem;
    border-radius: 2rem;
    background: var(--surface);
}

.freq-box {
    background: var(--bg);
    padding: 1.2rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    font-size: 0.95rem;
    max-height: 400px;
    overflow-y: auto;
}

.freq-table {
    width: 100%;
    border-collapse: collapse;
}

.freq-table th {
    text-align: left;
    color: var(--text-light);
    font-weight: 500;
    padding-bottom: 0.5rem;
    font-size: 0.9rem;
}

.freq-table td {
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border);
}

.positive {
    color: #2e7d5e;
}

.negative {
    color: #c44545;
}

.freq-bar {
    transition: width 0.3s ease;
    min-width: 4px;
}

.freq-note {
    margin-top: 1rem;
    padding: 0.5rem;
    background: var(--surface);
    border-radius: 1rem;
    text-align: center;
}

.attack-box {
    background: var(--bg);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    font-family: 'monospace', monospace;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 500px;
    overflow-y: auto;
}

.attack-box select {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.8rem 1.2rem;
    margin: 1rem 0;
    width: 100%;
    font-size: 1rem;
    cursor: pointer;
}

.attack-box select option {
    background: var(--surface);
    color: var(--text);
}

.candidate-text {
    font-family: 'monospace', monospace;
    background: var(--bg);
    padding: 1rem;
    border-radius: 1rem;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    line-height: 1.6;
    word-break: break-word;
}

.candidate-text.scrollable {
    max-height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'monospace', monospace;
    background: var(--bg);
    padding: 1rem;
    border-radius: 1rem;
    font-size: 0.95rem;
    line-height: 1.5;
    border: 1px solid var(--border);
}

.top-candidates {
    background: var(--surface);
    border: 2px solid var(--accent);
    border-radius: 1.5rem;
    padding: 1.5rem;
    margin: 1rem 0;
}

.top-candidates h4 {
    color: var(--accent);
    margin-bottom: 0.8rem;
}

.candidate-score {
    color: var(--text-light);
    font-size: 0.9rem;
    font-style: italic;
}

/* Estilos para cifrado */
.encrypt-options {
    background: var(--bg);
    padding: 1.5rem;
    border-radius: 1.5rem;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-group select {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 0.8rem;
    font-size: 1rem;
    cursor: pointer;
}

.params {
    display: none;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: 1rem;
    border: 1px solid var(--border);
}

.params.active {
    display: flex;
}

.note {
    color: var(--text-light);
    font-size: 0.85rem;
    font-style: italic;
}

.placeholder {
    color: var(--text-light);
    text-align: center;
    padding: 2rem;
    font-style: italic;
}

.error {
    color: var(--error);
    margin-top: 1rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    background: rgba(196, 69, 69, 0.1);
    border: 1px solid var(--error);
    display: none;
}

.error.show {
    display: block;
}

footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    body { padding: 1rem; }
    h1 { font-size: 1.8rem; }
    .cipher-card { padding: 0; }
    .card-header { padding: 1.2rem; }
    .card-content { padding: 1.2rem; }
    .button-group { flex-direction: column; }
    .ic-box { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
    .tabs { flex-direction: column; }
    .tab-btn { width: 100%; text-align: center; }
}