/**
 * Text to Unicode - Styles
 */

/* ========================================
   App Layout
   ======================================== */

.app-page {
    padding: var(--space-4);
    padding-top: calc(var(--header-height) + var(--space-4));
    min-height: calc(100vh - var(--header-height));
}

/* ========================================
   CRITICAL: App Container Centering
   ======================================== */

.ttu-container {
    width: 100%;
    max-width: var(--app-container-max);
    margin: 0 auto;
}

.app-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.app-header h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-2);
}

.app-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: 0;
}

/* ========================================
   Converter Container
   ======================================== */

.ttu {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* ========================================
   Controls
   ======================================== */

.ttu-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.ttu-controls-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.ttu-controls-right {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
}

.ttu-controls-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.ttu-mode-toggle {
    display: flex;
    gap: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

/*
 * Focus ring must not be clipped by the pill's overflow.
 * We draw the outer focus ring on the container and an inner
 * ring on the focused segment for clear keyboard indication.
 */
.ttu-mode-toggle:focus-within {
    box-shadow: var(--focus-ring);
    border-color: var(--color-primary);
}

.ttu-mode-btn {
    padding: var(--space-2) var(--space-5);
    min-height: 44px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    background: var(--color-bg-card);
    color: var(--color-text-muted);
    border: none;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.ttu-mode-btn:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.ttu-mode-btn--active {
    background: var(--color-primary);
    color: #fff;
}

.ttu-mode-btn--active:hover {
    background: var(--color-primary-dark);
    color: #fff;
}

.ttu-mode-btn:focus-visible {
    outline: none;
    box-shadow: inset 0 0 0 2px var(--color-primary-light);
    position: relative;
    z-index: 1;
}

.ttu-option {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.ttu-option-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.ttu-select {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    background: var(--color-bg-card);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    min-width: calc(var(--space-20) + var(--space-20) + var(--space-12) + var(--space-1));
    transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.ttu-select:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-border-dark);
}

.ttu-select:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.ttu-checkbox {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    user-select: none;
}

/* Buttons */
.ttu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    min-height: 44px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast), transform 0.1s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.ttu-btn:active {
    transform: scale(0.98);
}

.ttu-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.ttu-btn-primary {
    background: var(--color-primary);
    color: #fff;
    border: none;
}

.ttu-btn-primary:hover {
    background: var(--color-primary-dark);
}

.ttu-btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.ttu-btn-secondary:hover {
    background: var(--color-border);
}

/* ========================================
   Two-Panel Layout
   ======================================== */

.ttu-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: calc(
        var(--space-20) + var(--space-20) + var(--space-20) + var(--space-20) +
        var(--space-16) + var(--space-8) + var(--space-1)
    );
}

.ttu-panel {
    display: flex;
    flex-direction: column;
}

.ttu-panel--input {
    border-right: 1px solid var(--color-border);
}

.ttu-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.ttu-panel-title {
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin: 0;
}

.ttu-panel-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.ttu-textarea {
    flex: 1;
    width: 100%;
    min-height: calc(
        var(--space-20) + var(--space-20) + var(--space-20) + var(--space-20) +
        var(--space-12) + var(--space-3)
    );
    padding: var(--space-4);
    font-size: var(--font-size-sm);
    font-family: var(--font-mono);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg-card);
    border: none;
    resize: none;
    tab-size: 2;
}

.ttu-textarea::placeholder {
    color: var(--color-text-muted);
}

.ttu-textarea:focus {
    outline: none;
    background: var(--color-bg-alt);
}

.ttu-textarea--output {
    cursor: text;
}

.ttu-textarea--code {
    direction: ltr;
    text-align: left;
}

/* ========================================
   Help Panel (Modal)
   ======================================== */

.help-panel {
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    z-index: 200;
}

.help-panel[hidden] {
    display: none;
}

.help-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    max-width: var(--container-narrow);
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--space-6);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

/* Ensure close button meets minimum tap target requirements */
.help-panel .help-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: var(--space-2);
    border-radius: var(--radius-md);
}

.help-panel .help-close:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.help-body h3 {
    margin-top: var(--space-4);
}

.help-steps,
.help-features {
    padding-left: var(--space-5);
}

.keyboard-shortcuts {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.keyboard-shortcuts td {
    padding: var(--space-2) 0;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 900px) {
    .ttu-controls-right {
        width: 100%;
        justify-content: flex-start;
    }
}

@media (max-width: 768px) {
    .ttu-layout {
        grid-template-columns: 1fr;
    }

    .ttu-panel--input {
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .ttu-textarea {
        min-height: 220px;
    }

    .ttu-controls-actions {
        width: 100%;
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    .ttu-controls-actions,
    .ttu-controls-left,
    .ttu-controls-right {
        width: 100%;
    }

    .ttu-btn {
        width: 100%;
    }

    .ttu-select {
        width: 100%;
        min-width: 0;
    }

    .ttu-mode-btn {
        padding: var(--space-2) var(--space-4);
        font-size: var(--font-size-xs);
    }

    .ttu-textarea {
        min-height: 180px;
        font-size: var(--font-size-xs);
    }
}

/* ========================================
   RTL Support
   ======================================== */

[dir="rtl"] .ttu-panel--input {
    border-right: none;
    border-left: 1px solid var(--color-border);
}

[dir="rtl"] .help-steps,
[dir="rtl"] .help-features {
    padding-left: 0;
    padding-right: var(--space-5);
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    .ttu-btn,
    .ttu-mode-btn {
        transition: none;
    }

    .ttu-btn:active {
        transform: none;
    }
}

/* Help panel */
.help-panel {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    z-index: 200;
}

.help-panel[hidden] {
    display: none;
}

.help-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    max-width: 720px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--space-6);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.help-body h3 {
    margin-top: var(--space-4);
}

.help-steps,
.help-features {
    padding-inline-start: var(--space-5);
}

/* Header help button */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    cursor: pointer;
}

.btn-icon:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.btn-icon:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}