:root {
    --bg-color: #172038;
    --surface-color: rgba(23, 32, 56, 0.84);
    --surface-strong: rgba(37, 58, 94, 0.88);
    --surface-soft: rgba(18, 28, 49, 0.74);
    --text-color: #eef6f7;
    --muted-text: rgba(164, 221, 219, 0.72);
    --border-color: rgba(115, 190, 211, 0.18);
    --shadow-color: rgba(3, 9, 18, 0.34);
    --tool-accent: #7bb0ff;
}

body.light-mode {
    --bg-color: #f7f0e4;
    --surface-color: rgba(255, 251, 245, 0.88);
    --surface-strong: rgba(246, 238, 224, 0.92);
    --surface-soft: rgba(240, 231, 217, 0.84);
    --text-color: #2f1e21;
    --muted-text: rgba(77, 43, 50, 0.7);
    --border-color: rgba(122, 72, 65, 0.18);
    --shadow-color: rgba(75, 44, 29, 0.1);
    --tool-accent: #365b9d;
}

* {
    box-sizing: border-box;
}

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

body {
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(115, 190, 211, 0.12), transparent 28%),
        linear-gradient(180deg, var(--bg-color), color-mix(in srgb, var(--bg-color) 88%, black));
    color: var(--text-color);
}

body.modal-open {
    overflow: hidden;
}

button,
a,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

.page-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
}

.back-link,
.info-toggle,
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.8rem;
    padding: 0 1rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--surface-color);
    backdrop-filter: blur(16px);
    text-decoration: none;
    box-shadow: 0 14px 32px -24px var(--shadow-color);
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease;
}

.back-link:hover,
.info-toggle:hover,
.theme-toggle:hover,
.back-link:focus-visible,
.info-toggle:focus-visible,
.theme-toggle:focus-visible {
    transform: translateY(-1px);
    border-color: rgba(115, 190, 211, 0.4);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

.workspace {
    min-height: 100vh;
    padding: 3.95rem 1rem 0.55rem;
}

.encryption-shell {
    width: min(1380px, 100%);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(240px, 300px) minmax(0, 1fr) minmax(260px, 320px);
    gap: 1rem;
    align-items: stretch;
}

.controls-panel,
.editor-panel,
.analysis-panel {
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    background: var(--surface-color);
    box-shadow: 0 24px 48px -34px var(--shadow-color);
}

.controls-panel,
.analysis-panel {
    display: grid;
    align-content: start;
    gap: 0.9rem;
    padding: 1.1rem;
}

.editor-panel {
    padding: 0.85rem;
}

.panel-header h1,
.panel-header h2 {
    margin: 0;
    line-height: 1;
}

.panel-header h1 {
    font-size: clamp(2.1rem, 4vw, 3rem);
}

.panel-header h2 {
    font-size: 1.8rem;
}

.panel-copy,
.toggle-copy,
.insight-copy,
.note-card,
.metric-value,
.text-box {
    line-height: 1.65;
}

.panel-copy {
    margin: 0.65rem 0 0;
    color: var(--muted-text);
}

.eyebrow,
.label {
    margin: 0;
    color: var(--muted-text);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.control-group {
    display: grid;
    gap: 0.55rem;
}

.rsa-group,
.classical-options-group {
    display: grid;
    gap: 0.9rem;
}

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

.value-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.4rem;
    min-height: 2rem;
    padding: 0 0.7rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--surface-strong);
    color: var(--tool-accent);
    font-weight: 700;
}

.panel-input,
.text-box {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    background: var(--surface-strong);
    outline: none;
}

.panel-input {
    min-height: 3rem;
    padding: 0 0.95rem;
}

.panel-input:focus-visible,
.text-box:focus-visible,
.panel-range:focus-visible {
    border-color: rgba(115, 190, 211, 0.45);
}

.panel-range {
    width: 100%;
    accent-color: var(--tool-accent);
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.95rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    background: var(--surface-soft);
}

.toggle-row input {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--tool-accent);
}

.toggle-copy {
    display: block;
    margin-top: 0.25rem;
    color: var(--muted-text);
    font-size: 0.92rem;
}

.note-card,
.metric-card,
.insight-block,
.text-card {
    border: 1px solid var(--border-color);
    border-radius: 1.1rem;
    background: var(--surface-soft);
}

.note-card {
    padding: 0.9rem;
    color: var(--muted-text);
}

.editor-stack {
    display: grid;
    grid-template-rows: 1fr 1fr;
    gap: 0.85rem;
    min-height: calc(100vh - 10rem);
}

.text-card {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 0.7rem;
    padding: 0.85rem;
}

.card-header h2 {
    margin: 0.25rem 0 0;
    font-size: 1.45rem;
}

.text-box {
    resize: none;
    min-height: 0;
    padding: 0.85rem;
    color: var(--text-color);
}

.output-box {
    color: var(--tool-accent);
}

.analysis-grid {
    display: grid;
    gap: 0.85rem;
}

.metric-card {
    padding: 0.85rem 0.95rem;
}

.metric-value {
    margin: 0.55rem 0 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--tool-accent);
}

.insight-block {
    padding: 0.9rem;
}

.insight-copy {
    margin: 0.55rem 0 0;
    color: var(--muted-text);
    overflow-wrap: anywhere;
}

.info-modal[hidden] {
    display: none;
}

.info-modal {
    position: fixed;
    inset: 0;
    z-index: 30;
}

.info-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(8, 14, 28, 0.58);
    backdrop-filter: blur(10px);
}

.info-panel {
    position: absolute;
    top: 50%;
    left: 50%;
    width: min(820px, calc(100% - 1.5rem));
    max-height: min(80vh, 900px);
    overflow: auto;
    transform: translate(-50%, -50%);
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    background: var(--surface-color);
    box-shadow: 0 24px 64px -30px var(--shadow-color);
}

.info-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.info-header h2 {
    margin: 0;
    font-size: 1.8rem;
    line-height: 1.05;
}

.info-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.8rem;
    padding: 0 1rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--surface-color);
    cursor: pointer;
}

.info-content {
    display: grid;
    gap: 1rem;
}

.info-content section {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    background: rgba(255, 255, 255, 0.02);
}

.info-content h3 {
    margin: 0 0 0.6rem;
}

.info-content p {
    margin: 0;
    line-height: 1.65;
    color: var(--muted-text);
}

@media (max-width: 1100px) {
    .encryption-shell {
        grid-template-columns: 1fr;
    }

    .editor-stack {
        min-height: auto;
    }

    .text-box {
        min-height: 220px;
    }
}

@media (max-width: 760px) {
    .page-header {
        padding: 0.85rem;
    }

    .workspace {
        padding: 4.7rem 0.75rem 0.75rem;
    }

    .controls-panel,
    .analysis-panel,
    .editor-panel {
        padding-left: 0.95rem;
        padding-right: 0.95rem;
    }

    .text-card {
        padding: 0.85rem;
    }

    .info-header {
        flex-direction: column;
    }
}