/* ================================
   VARIABLES Y PROPIEDADES GLOBALES
   ================================ */

:root {
    --color-bg: #f5f3f0;
    --color-bg-secondary: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-border: #e0e0e0;
    --color-primary: #1a1a1a;
    --color-accent: #ff6b6b;
    --color-success: #51cf66;
    
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    --radius: 0.375rem;
    --radius-md: 0.5rem;
    
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Georgia', 'Garamond', serif;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1a1a1a;
        --color-bg-secondary: #2d2d2d;
        --color-text: #f5f3f0;
        --color-text-secondary: #b0b0b0;
        --color-border: #404040;
        --color-primary: #f5f3f0;
    }
}

/* ================================
   RESET Y BASE
   ================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: var(--transition-slow);
}

/* ================================
   TIPOGRAFÍA
   ================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

em {
    font-family: var(--font-serif);
    font-style: italic;
}

kbd {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.1rem 0.4rem;
    font-size: 0.85em;
    font-family: 'Monaco', 'Courier New', monospace;
}

/* ================================
   CONTENEDOR PRINCIPAL
   ================================ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-lg);
}

/* ================================
   HEADER
   ================================ */

.header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.header__content {
    max-width: 700px;
}

.header__title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 400;
    margin-bottom: var(--space-sm);
    letter-spacing: -1px;
}

.header__title em {
    font-size: 0.9em;
}

.header__subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* ================================
   CONTROLES
   ================================ */

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.controls__group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    align-items: center;
}

.controls__fieldset {
    border: none;
}

.button-group {
    display: flex;
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.button-group .btn {
    border-radius: 0;
    border: none;
    border-right: 1px solid var(--color-border);
    flex: 1;
    min-width: 60px;
}

.button-group .btn:last-child {
    border-right: none;
}

.controls__actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ================================
   BOTONES
   ================================ */

.btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    white-space: nowrap;
}

.btn:hover:not(:disabled) {
    background-color: var(--color-text);
    color: var(--color-bg-secondary);
}

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
    font-weight: 700;
    padding: 0.75rem 2rem;
}

.btn--primary:hover:not(:disabled) {
    background-color: var(--color-text);
    border-color: var(--color-text);
    color: var(--color-bg);
}

.btn--secondary {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn[aria-pressed="true"] {
    background-color: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

.btn--size[aria-pressed="true"],
.btn--format[aria-pressed="true"] {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

/* ================================
   SECCIÓN PRINCIPAL
   ================================ */

.main {
    min-height: 60vh;
}

.palette {
    animation: fadeIn 0.3s ease;
}

.palette__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.palette__title {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.palette__status {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-secondary);
}

.palette__colors {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-xs);
    min-height: 300px;
}

/* Color card */
.color-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    min-height: 220px;
    group: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.color-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.color-card__display {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: var(--transition);
}

.color-card__content {
    position: relative;
    z-index: 2;
    padding: var(--space-md);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    min-height: 80px;
}

.color-card__code {
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'Monaco', 'Courier New', monospace;
    color: #ffffff;
    letter-spacing: 0.5px;
    flex: 1;
}

.color-card__actions {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.color-card__btn {
    background-color: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 0.7rem;
    padding: 0.2rem 0.3rem;
    min-width: unset;

}

.color-card__btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

.color-card__btn:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

.color-card__btn--locked {
    background: rgba(255, 255, 255, 0.3);
}

/* ================================
   MODAL
   ================================ */

.modal {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-secondary);
    max-width: 500px;
    width: 90vw;
    max-height: 80vh;
    padding: 0;
    animation: slideUp 0.3s ease;
}

.modal::backdrop {
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal__content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.modal__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal__title {
    font-size: 1.25rem;
    margin: 0;
}

.modal__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    transition: var(--transition);
}

.modal__close:hover {
    background-color: var(--color-border);
}

.modal__close:focus-visible {
    outline: 2px solid var(--color-accent);
}

.modal__body {
    overflow-y: auto;
    padding: var(--space-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.modal__empty {
    text-align: center;
    color: var(--color-text-secondary);
    padding: var(--space-lg);
}

/* Saved palette item */
.saved-palette {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem;
}

.saved-palette__preview {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    flex: 1;
}

.saved-palette__color {
    border-radius: 50%;
    width: 30px;
    height: 30px;
    flex-shrink: 0;
}

.saved-palette__info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-width: 0;
}

.saved-palette__time {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.saved-palette__codes {
    word-break: break-all;
    font-size: 0.7rem;
    line-height: 1.4;
    color: #888;
    max-height: 3rem;
    overflow: hidden;
}

.saved-palette__actions {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex-shrink: 0;
}

.saved-palette__btn {
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    font-size: 0.75rem;
    width: auto;
    height: auto;
}

.saved-palette__btn:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.saved-palette__delete {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.saved-palette__delete:hover {
    opacity: 0.8;
}

/* ================================
   TOAST NOTIFICATION
   ================================ */

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: var(--space-md);
    background-color: var(--color-primary);
    color: var(--color-bg);
    border-radius: var(--radius-md);
    max-width: 300px;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    z-index: 1000;
    transition: var(--transition);
    font-size: 0.875rem;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

/* ================================
   FOOTER
   ================================ */

.footer {
    text-align: center;
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer__text {
    margin: var(--space-xs) 0;
}

/* ================================
   ACCESIBILIDAD
   ================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ================================
   ANIMACIONES
   ================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ================================
   RESPONSIVE
   ================================ */

@media (max-width: 768px) {
    .container {
        padding: var(--space-md);
    }

    .controls {
        flex-direction: column;
        align-items: flex-start;
    }

    .controls__actions {
        width: 100%;
    }

    .controls__actions .btn--primary {
        width: 100%;
    }

    .palette__header {
        flex-direction: column;
        align-items: flex-start;
    }

    .palette__colors {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 0.25rem;
    }

    .toast {
        right: 1rem;
        left: 1rem;
        bottom: 1rem;
        max-width: none;
    }

    .modal {
        width: 95vw;
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    .header__title {
        font-size: 1.75rem;
    }

    .palette__colors {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    }

    .color-card__content {
         padding: 0.4rem;
         font-size: 0.65rem;
    }

    .color-card__code {
        font-size: 0.75rem;
    }

    .button-group {
        width: 100%;
    }

    .button-group .btn {
        flex: 1;
        min-width: auto;
    }
}