:root {
    --bg-dark: #1a1a2e;
    --card-bg: #2a2a4a;
    --accent-purple: #8e44ad;
    --accent-blue: #3498db;
    --text-light: #e0e0e0;
    --text-dark: #bbbbbb;
    --positive-green: #2ecc71;
    --negative-red: #e74c3c;
    --border-color: #4a4a6e;
    --hover-bg: #3a3a5a;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --footer-bg: #111122;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark), #0f0f1f);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    box-sizing: border-box;
    overflow-x: hidden;
    padding: 20px;
    padding-bottom: 100px;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 20px;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
    animation: fadeIn 1s ease-out;
    flex-grow: 1;
    margin: 0 auto;
}

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

.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.app-title {
    font-size: 2.8em;
    font-weight: 700;
    color: var(--accent-blue);
    text-shadow: 0 0 15px rgba(52, 152, 219, 0.6);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.app-tagline {
    font-size: 1.3em;
    color: var(--text-dark);
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: 300;
    letter-spacing: 0.5px;
    animation: slideInText 1.2s ease-out forwards;
    opacity: 0;
}

@keyframes slideInText {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}


.header-icon {
    font-size: 1.2em;
    color: var(--accent-purple);
    animation: pulse 2s infinite alternate;
}

@keyframes pulse {
    from { transform: scale(1); opacity: 0.8; }
    to { transform: scale(1.1); opacity: 1; }
}

.search-bar {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.search-input {
    width: 60%;
    max-width: 400px;
    padding: 15px 20px;
    border: 2px solid var(--accent-purple);
    border-radius: 10px;
    background-color: var(--card-bg);
    color: var(--text-light);
    font-size: 1.1em;
    outline: none;
    transition: all 0.3s ease;
    box-shadow: inset 0 0 10px rgba(142, 68, 173, 0.3);
}

.search-input::placeholder {
    color: var(--text-dark);
}

.search-input:focus {
    border-color: var(--accent-blue);
    box-shadow: inset 0 0 15px rgba(52, 152, 219, 0.5), 0 0 10px rgba(52, 152, 219, 0.4);
}

.search-button {
    padding: 15px 25px;
    background: linear-gradient(45deg, var(--accent-purple), var(--accent-blue));
    color: var(--text-light);
    border: none;
    border-radius: 10px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    opacity: 0.9;
}

.search-button:active {
    transform: translateY(0);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 50px;
    color: var(--accent-blue);
    font-size: 1.2em;
    font-weight: 600;
}

.spinner {
    border: 8px solid rgba(52, 152, 219, 0.2);
    border-top: 8px solid var(--accent-blue);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    background-color: #c0392b;
    color: var(--text-light);
    padding: 15px 20px;
    border-radius: 10px;
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1.1em;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    animation: slideIn 0.5s ease-out;
}

.error-message.hidden {
    display: none;
}

.error-message i {
    margin-right: 10px;
}

.close-error {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.5em;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.close-error:hover {
    transform: rotate(90deg);
}

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

.crypto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.crypto-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 25px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
    animation: cardFadeIn 0.5s ease-out forwards;
    opacity: 0;
    cursor: pointer;
}

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

.crypto-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
    background-color: var(--hover-bg);
}

.crypto-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(142, 68, 173, 0.1) 0%, transparent 70%);
    transform: rotate(45deg);
    transition: transform 0.5s ease-out;
    z-index: 0;
    opacity: 0;
}

.crypto-card:hover::before {
    transform: rotate(0deg);
    opacity: 1;
}

.crypto-card-content {
    position: relative;
    z-index: 1;
    width: 100%;
}

.crypto-image {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin-bottom: 15px;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

.crypto-name {
    font-size: 1.8em;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--accent-blue);
    text-shadow: 0 0 8px rgba(52, 152, 219, 0.4);
}

.crypto-symbol {
    font-size: 1.1em;
    color: var(--text-dark);
    margin-bottom: 15px;
    text-transform: uppercase;
}

.crypto-price {
    font-size: 2.2em;
    font-weight: 700;
    color: var(--positive-green);
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.crypto-change {
    font-size: 1.2em;
    font-weight: 600;
    margin-bottom: 10px;
    padding: 5px 10px;
    border-radius: 8px;
    display: inline-block;
    transition: background-color 0.3s ease;
}

.positive-change {
    color: var(--positive-green);
    background-color: rgba(46, 204, 113, 0.15);
}

.negative-change {
    color: var(--negative-red);
    background-color: rgba(231, 76, 60, 0.15);
}

.crypto-market-cap,
.crypto-rank {
    font-size: 0.95em;
    color: var(--text-dark);
    margin-top: 8px;
}

.crypto-rank {
    font-weight: 600;
    color: var(--accent-purple);
}

.footer {
    width: 100%;
    text-align: center;
    padding: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-dark);
    font-size: 0.9em;
    background-color: var(--footer-bg);
    border-radius: 15px 15px 0 0;
    box-shadow: 0 -5px 15px rgba(0, 0, 0, 0.2);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-sizing: border-box;
}

.footer p {
    margin-bottom: 15px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-links a {
    color: var(--text-light);
    font-size: 1.5em;
    transition: color 0.3s ease, transform 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-blue);
    transform: translateY(-3px) scale(1.1);
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px 15px;
    background: linear-gradient(45deg, #5c3498, #2b7bbd);
    color: var(--text-light);
    border-radius: 8px;
    text-decoration: none;
    font-size: 1em;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    opacity: 0.9;
}

.coin-details-section {
    margin-top: 30px;
    padding: 20px;
    background-color: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 8px 25px var(--shadow-color);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.coin-header-details {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
    width: 100%;
}

.coin-detail-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin-bottom: 15px;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

.coin-detail-name {
    font-size: 2.5em;
    font-weight: 700;
    color: var(--accent-blue);
    text-shadow: 0 0 10px rgba(52, 152, 219, 0.5);
    margin-bottom: 5px;
}

.coin-detail-rank {
    font-size: 1.2em;
    color: var(--accent-purple);
    font-weight: 600;
    margin-bottom: 10px;
}

.coin-detail-price {
    font-size: 3em;
    font-weight: 700;
    color: var(--positive-green);
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.coin-detail-change {
    font-size: 1.5em;
    font-weight: 600;
    padding: 8px 15px;
    border-radius: 10px;
    display: inline-block;
    margin-bottom: 20px;
}

.coin-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    width: 100%;
    margin-bottom: 40px;
}

.stat-item {
    background-color: rgba(0, 0, 0, 0.3);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.2);
}

.stat-label {
    font-size: 0.9em;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.3em;
    font-weight: 600;
    color: var(--text-light);
    word-wrap: break-word; /* Ensure long numbers break and wrap */
    overflow-wrap: break-word; /* Standard property for word wrapping */
}

.coin-graph-section {
    width: 90%;
    max-width: 800px;
    margin-bottom: 40px;
    background-color: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.coin-graph-section h3 {
    text-align: center;
    color: var(--accent-blue);
    margin-bottom: 20px;
    font-size: 1.8em;
    text-shadow: 0 0 8px rgba(52, 152, 219, 0.4);
}

.coin-graph-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
    margin: 0 auto;
}

.coin-graph-wrapper canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
}


.coin-description-section {
    width: 100%;
    background-color: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    text-align: left;
}

.coin-description-section h3 {
    text-align: center;
    color: var(--accent-purple);
    margin-bottom: 20px;
    font-size: 1.8em;
    text-shadow: 0 0 8px rgba(142, 68, 173, 0.4);
}

.description-content p {
    margin-bottom: 1em;
    line-height: 1.6;
    color: var(--text-light);
}

.description-content a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

.description-content a:hover {
    color: var(--accent-purple);
    text-decoration: underline;
}


@media (max-width: 768px) {
    body {
        padding: 10px;
        padding-bottom: 120px;
    }

    .container {
        padding: 15px;
    }

    .app-title {
        font-size: 2em;
        flex-direction: column;
        gap: 5px;
    }

    .app-tagline {
        font-size: 1em;
    }

    .header-icon {
        font-size: 1em;
    }

    .search-bar {
        flex-direction: column;
        gap: 10px;
    }

    .search-input {
        width: 90%;
        max-width: none;
    }

    .search-button {
        width: 90%;
    }

    .crypto-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .crypto-card {
        padding: 20px;
    }

    .crypto-name {
        font-size: 1.5em;
    }

    .crypto-price {
        font-size: 1.8em;
    }

    .footer {
        padding: 15px;
    }

    .social-links {
        gap: 15px;
    }

    .social-links a {
        font-size: 1.2em;
    }

    .back-button {
        position: static;
        margin-bottom: 20px;
        width: fit-content;
        align-self: flex-start;
    }

    .coin-detail-name {
        font-size: 2em;
    }

    .coin-detail-price {
        font-size: 2.5em;
    }

    .coin-detail-change {
        font-size: 1.2em;
    }

    .coin-stats-grid {
        grid-template-columns: 1fr;
    }

    .coin-graph-section,
    .coin-description-section {
        width: 100%;
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .app-title {
        font-size: 1.8em;
    }
}