:root {
    --bg-color: #FFFFFF;
    --text-color: #1A1A1A;
    --element-bg: #FFFFFF;
    --input-color: #696969;
    --accent-color: #7B68EE;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 6px -1px rgba(123, 104, 238, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 16px -4px rgba(123, 104, 238, 0.12), 0 4px 8px -2px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 20px 25px -5px rgba(123, 104, 238, 0.18), 0 10px 10px -5px rgba(0, 0, 0, 0.08);
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
    --border-radius-lg: 16px;
}

[data-theme="dark"] {
    --bg-color: hsl(207, 26%, 17%);
    --text-color: hsl(0, 0%, 100%);
    --element-bg: hsl(209, 23%, 22%);
    --input-color: hsl(0, 0%, 100%);
    --accent-color: #7B68EE;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 16px -4px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Nunito Sans', sans-serif;
    background: linear-gradient(180deg, #FFFFFF 0%, #F8F0FF 100%);
    background-attachment: fixed;
    color: var(--text-color);
    transition: background var(--transition-slow), color var(--transition-base);
    min-height: 100vh;
    overflow-x: hidden;
}

[data-theme="dark"] body {
    background: var(--bg-color);
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    background-color: var(--element-bg);
    box-shadow: var(--shadow);
    padding: 28px 0;
    margin-bottom: 48px;
    position: sticky;
    top: 0;
    z-index: 50;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(123, 104, 238, 0.05);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-color);
    letter-spacing: -0.02em;
    transition: color var(--transition-base);
}

#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    font-weight: 600;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 8px;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

#theme-toggle::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-color);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

#theme-toggle:hover::before {
    opacity: 0.1;
}

#theme-toggle:active {
    transform: scale(0.95);
}

#theme-toggle span,
#theme-toggle i {
    position: relative;
    z-index: 1;
}

.controls-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 48px;
    animation: fadeInUp 0.5s ease-out;
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.search-wrapper {
    background-color: var(--element-bg);
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    padding: 18px 32px;
    display: flex;
    align-items: center;
    gap: 24px;
    color: var(--input-color);
    max-width: 480px;
    width: 100%;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.search-wrapper:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.search-wrapper i {
    color: var(--input-color);
    transition: all var(--transition-fast);
    font-size: 1.1rem;
}

.search-wrapper:focus-within i {
    color: var(--accent-color);
    transform: scale(1.1);
}

.search-wrapper input {
    border: none;
    background: transparent;
    color: var(--text-color);
    font-family: inherit;
    width: 100%;
    outline: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color var(--transition-base);
}

.search-wrapper input::placeholder {
    color: var(--input-color);
    font-weight: 400;
    opacity: 0.7;
}

.filter-wrapper {
    position: relative;
}

.filter-wrapper::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-color);
    transition: transform var(--transition-fast);
}

.filter-wrapper:hover::after {
    transform: translateY(-50%) rotate(180deg);
}

.filter-wrapper select {
    background-color: var(--element-bg);
    color: var(--text-color);
    box-shadow: var(--shadow);
    border: 2px solid transparent;
    padding: 18px 48px 18px 24px;
    border-radius: var(--border-radius);
    font-family: inherit;
    cursor: pointer;
    width: 220px;
    outline: none;
    font-weight: 600;
    font-size: 0.95rem;
    appearance: none;
    transition: all var(--transition-base);
}

.filter-wrapper select:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

.filter-wrapper select:focus {
    border-color: var(--accent-color);
}

#countries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 48px;
    padding-bottom: 80px;
}

.country-card {
    background-color: var(--element-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-slow);
    display: flex;
    flex-direction: column;
    opacity: 0;
    animation: cardFadeIn 0.5s ease-out forwards;
    border: 1px solid transparent;
}

@keyframes cardFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.country-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-hover);
    border-color: rgba(123, 104, 238, 0.2);
}

.flag-container {
    height: 180px;
    width: 100%;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
}

[data-theme="dark"] .flag-container {
    background: linear-gradient(135deg, #2a2a3a 0%, #1a1a2a 100%);
}

.flag-container::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.country-card:hover .flag-container::after {
    opacity: 1;
}

.flag-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.country-card:hover .flag-container img {
    transform: scale(1.1);
}

.card-body {
    padding: 28px 24px;
    flex: 1;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 800;
    margin-bottom: 18px;
    line-height: 1.3;
    letter-spacing: -0.01em;
    color: var(--text-color);
    transition: color var(--transition-base);
}

.card-info p {
    font-size: 0.9rem;
    margin-bottom: 10px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-color);
    transition: color var(--transition-base);
}

.card-info span {
    font-weight: 300;
    opacity: 0.85;
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    font-size: 1.2rem;
    margin-top: 80px;
    color: var(--input-color);
    animation: pulse 2s ease-in-out infinite;
}

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

.skeleton {
    background: linear-gradient(90deg,
        rgba(200, 200, 200, 0.2) 25%,
        rgba(200, 200, 200, 0.3) 50%,
        rgba(200, 200, 200, 0.2) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: 8px;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.hidden {
    display: none !important;
}

#detail-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    z-index: 100;
    overflow-y: auto;
    padding: 80px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: modalFadeIn 0.3s ease-out;
}

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

.back-btn {
    background-color: var(--element-bg);
    color: var(--text-color);
    border: 2px solid transparent;
    box-shadow: var(--shadow);
    padding: 12px 36px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    margin-bottom: 80px;
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 1440px;
    margin-left: auto;
    margin-right: auto;
    width: fit-content;
    transition: all var(--transition-base);
    animation: slideInLeft 0.4s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.back-btn:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px) translateX(-4px);
    border-color: var(--accent-color);
}

.back-btn:active {
    transform: translateY(0) translateX(0);
}

.back-btn i {
    transition: transform var(--transition-fast);
}

.back-btn:hover i {
    transform: translateX(-4px);
}

#detail-modal>* {
    width: 100%;
    max-width: 1440px;
}

.detail-flex {
    display: flex;
    flex-direction: column;
    gap: 48px;
    animation: scaleIn 0.5s ease-out;
}

.detail-flag {
    width: 100%;
    max-width: 560px;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.detail-flag img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-slow);
}

.detail-flag:hover img {
    transform: scale(1.05);
}

.detail-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.detail-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 32px;
    color: var(--text-color);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.detail-info-grid {
    display: flex;
    flex-direction: column;
    gap: 48px;
    margin-bottom: 48px;
}

.detail-info-group p {
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.6;
}

.detail-info-group span {
    font-weight: 300;
    color: var(--input-color);
    opacity: 0.9;
}

.border-countries {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-top: 24px;
}

.border-countries strong {
    font-weight: 600;
    white-space: nowrap;
    color: var(--text-color);
    font-size: 0.95rem;
}

.border-btn {
    background-color: var(--element-bg);
    color: var(--text-color);
    border: 2px solid rgba(123, 104, 238, 0.1);
    box-shadow: var(--shadow-sm);
    padding: 8px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition-base);
}

.border-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
    background-color: rgba(123, 104, 238, 0.05);
}

.border-btn:active {
    transform: translateY(0);
}

#map {
    height: 400px;
    width: 100%;
    margin-top: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    z-index: 1;
    overflow: hidden;
    animation: fadeIn 0.6s ease-out 0.2s both;
}

@media (min-width: 768px) {
    .controls-container {
        flex-direction: row;
        justify-content: space-between;
        gap: 32px;
    }

    h1 {
        font-size: 1.5rem;
    }

    header {
        padding: 32px 0;
    }

    .detail-flex {
        flex-direction: row;
        gap: 80px;
        align-items: center;
    }

    .detail-info-grid {
        flex-direction: row;
        justify-content: space-between;
        gap: 80px;
    }

    .detail-title {
        font-size: 2.5rem;
    }

    #map {
        height: 450px;
    }
}

@media (min-width: 1024px) {
    #countries-grid {
        gap: 64px;
    }

    .detail-flex {
        gap: 120px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}