/* ==========================================================================
   Curioso Design System
   Refined B&W editorial aesthetic
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-gray-warm: #767676;
    --color-gray-light: #F5F5F5;
    --color-gray-200: #E5E5E5;
    --color-gray-medium: #999999;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    /* Radii */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 150ms;
    --duration-normal: 200ms;
    --duration-slow: 300ms;

    /* Typography */
    --font-serif: Georgia, 'Times New Roman', serif;
    --font-sans: Helvetica, 'Helvetica Neue', Arial, sans-serif;
}

/* --------------------------------------------------------------------------
   Typography Utilities
   -------------------------------------------------------------------------- */
.font-serif {
    font-family: var(--font-serif);
}

.font-sans {
    font-family: var(--font-sans);
}

/* --------------------------------------------------------------------------
   Card Component
   -------------------------------------------------------------------------- */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: box-shadow var(--duration-slow) var(--ease-out);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card__image {
    overflow: hidden;
    background-color: var(--color-gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.98);
}

.card__body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-xl);
}

.card__title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--color-black);
    margin-bottom: var(--space-sm);
}

.card__meta {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-gray-warm);
    margin-bottom: var(--space-lg);
}

.card__connection {
    font-family: var(--font-sans);
    font-style: italic;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-black);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-gray-200);
    flex: 1;
}

/* --------------------------------------------------------------------------
   Badge Component
   -------------------------------------------------------------------------- */
.badge {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-gray-warm);
    border-left: 2px solid var(--color-black);
    padding-left: var(--space-sm);
    line-height: 1;
}

/* --------------------------------------------------------------------------
   Action Button Component
   -------------------------------------------------------------------------- */
.action-btn {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    background: transparent;
    cursor: pointer;
    transition: background-color var(--duration-normal) var(--ease-out),
                border-color var(--duration-normal) var(--ease-out);
}

.action-btn:hover {
    background-color: var(--color-gray-light);
    border-color: var(--color-gray-warm);
}

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

.action-btn svg {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform var(--duration-fast) var(--ease-out);
}

.action-btn:hover svg {
    transform: scale(1.1);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 40;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-200);
    padding: 0.625rem var(--space-xl);
}

.nav__wordmark {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--color-black);
    text-decoration: none;
    transition: opacity var(--duration-normal) var(--ease-out);
}

.nav__wordmark:hover {
    opacity: 0.6;
}

.nav__link {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-black);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 1.5px solid transparent;
    transition: border-color var(--duration-normal) var(--ease-out),
                opacity var(--duration-normal) var(--ease-out);
}

.nav__link:hover {
    opacity: 0.6;
}

.nav__link--active {
    border-bottom-color: var(--color-black);
}

/* Hamburger button — hidden on desktop */
.nav__burger {
    display: none;
}

/* --------------------------------------------------------------------------
   Mobile Navigation (≤ 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .nav__burger {
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 44px;
        height: 44px;
        padding: 10px;
        background: none;
        border: none;
        cursor: pointer;
        z-index: 2;
    }

    .nav__burger span {
        display: block;
        width: 100%;
        height: 2px;
        background-color: var(--color-black);
        border-radius: 1px;
        transition: transform var(--duration-normal) var(--ease-out),
                    opacity var(--duration-normal) var(--ease-out);
    }

    /* Animate burger → X */
    .nav__burger--open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav__burger--open span:nth-child(2) {
        opacity: 0;
    }

    .nav__burger--open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    /* Menu panel — hidden by default on mobile */
    .nav__menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-gray-200);
        padding: var(--space-sm) var(--space-xl) var(--space-lg);
    }

    .nav__menu--open {
        display: flex;
    }

    /* Make the nav container a positioning context */
    .nav > div {
        position: relative;
    }

    /* Stack links vertically with comfortable tap targets */
    .nav__menu .nav__link {
        display: block;
        padding: 0.75rem 0;
        font-size: 1rem;
        border-bottom: none;
    }

    .nav__menu .nav__link--active {
        border-bottom: none;
        font-weight: 600;
    }

    .nav__menu .nav__greeting {
        display: block;
        padding: 0.75rem 0 0.25rem;
        border-top: 1px solid var(--color-gray-200);
        margin-top: var(--space-xs);
    }

    .nav__menu form {
        display: block;
    }

    .nav__menu form .nav__link {
        text-align: left;
        width: 100%;
        padding: 0.5rem 0 0.75rem;
    }
}

/* Desktop: ensure nav__menu displays as flex row */
@media (min-width: 769px) {
    .nav__menu {
        display: flex;
        align-items: center;
        gap: 2rem;
    }
}

/* --------------------------------------------------------------------------
   Toast Notification
   -------------------------------------------------------------------------- */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 50;
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
}

.toast svg {
    width: 1.125rem;
    height: 1.125rem;
    margin-right: 0.5rem;
    fill: white;
}

/* --------------------------------------------------------------------------
   Loading Card
   -------------------------------------------------------------------------- */
.loading-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-card__spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
}

.loading-card__text {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--color-black);
}

/* --------------------------------------------------------------------------
   Empty Card
   -------------------------------------------------------------------------- */
.empty-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-xl);
    text-align: center;
}

.empty-card__text {
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-gray-warm);
}

/* --------------------------------------------------------------------------
   Star Rating
   -------------------------------------------------------------------------- */
.star-rating {
    display: flex;
    gap: 2px;
}

.star-rating__star {
    width: 1.25rem;
    height: 1.25rem;
    padding: 0;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--color-gray-200);
    transition: color 0.15s ease;
}

.star-rating__star:hover,
.star-rating__star:hover ~ .star-rating__star {
    color: var(--color-gray-warm);
}

.star-rating__star--filled {
    color: var(--color-black);
}

.star-rating__star svg {
    width: 100%;
    height: 100%;
}

/* Hover: fill stars up to hovered one */
.star-rating:hover .star-rating__star {
    color: var(--color-black);
}

.star-rating:hover .star-rating__star:hover ~ .star-rating__star {
    color: var(--color-gray-200);
}

/* --------------------------------------------------------------------------
   Filter Pills
   -------------------------------------------------------------------------- */
.filter-pills {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.filter-pill {
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--color-gray-200);
    border-radius: 999px;
    background: none;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--color-gray-warm);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
}

.filter-pill:hover {
    border-color: var(--color-black);
    color: var(--color-black);
}

.filter-pill--active {
    background: var(--color-black);
    border-color: var(--color-black);
    color: var(--color-white);
}

.filter-pill--active:hover {
    color: var(--color-white);
}

/* --------------------------------------------------------------------------
   Sort Select
   -------------------------------------------------------------------------- */
.sort-select {
    appearance: none;
    padding: 0.375rem 2rem 0.375rem 0.75rem;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    background: var(--color-white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23767676' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 0.5rem center;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--color-gray-warm);
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.sort-select:hover,
.sort-select:focus {
    border-color: var(--color-black);
    outline: none;
}

/* --------------------------------------------------------------------------
   Onboarding Spinner
   -------------------------------------------------------------------------- */
.onboarding-spinner {
    width: 64px;
    height: 64px;
    border: 4px solid #e5e5e5;
    border-top-color: #1a1a1a;
    border-radius: 50%;
    margin: 0 auto;
    animation: onboarding-spin 0.9s linear infinite;
}

@keyframes onboarding-spin {
    to { transform: rotate(360deg); }
}