/* Base Styles */
:root {
    --font-sans: "Inter", sans-serif;
    --text-color: rgb(25, 25, 24);
    --text-color-muted: rgba(25, 25, 24, 0.9);
    --selection-color: rgba(35, 131, 226, 0.28);
    --caret-color: rgb(55, 53, 47);
    --sidebar-text: rgba(25, 23, 17, 0.6);
    --hover-surface: rgba(55, 53, 47, 0.08);
    --primary-blue: #2383E2;
    --primary-blue-hover: #1B6DC1;
    --primary-blue-active: #155A9E;
    --border-color: rgba(55, 53, 47, 0.12);
    --bg-color: #fafafa;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;
}

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

body {
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.55;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-32) var(--space-24);
}

/* Typography */
.app-header {
    text-align: center;
    margin-bottom: var(--space-24);
    padding: var(--space-16) var(--space-24);
    margin: calc(-1 * var(--space-32)) calc(-1 * var(--space-24)) var(--space-24);
}

.app-header__title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.025em;
    color: var(--text-color);
    margin: 0;
    padding-bottom: var(--space-16);
}

.app-header__title::after {
    content: "";
    display: block;
    width: 40%;
    height: 1px;
    background: var(--border-color);
    margin: var(--space-16) auto 0;
}

/* Input Section */
.input-section {
    margin-bottom: 64px;
}

.input-group {
    display: flex;
    gap: 12px;
}

input[type="text"] {
    flex: 1;
    font-size: 18px;
    padding: 12px 16px;
    border: 0.5px solid rgba(55, 53, 47, 0.16);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    border-color: var(--primary-blue);
}

.primary-button {
    font-family: "Inter", sans-serif;
    font-size: 16px;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: 50px;
    background: #000000;
    color: white;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.primary-button:hover {
    background: #1a1a1a;
}

.primary-button:active {
    background: #333333;
}

.primary-button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* Results Section */
.results-section {
    min-height: 200px;
}

.hidden {
    display: none;
}

/* Loader */
.loader {
    text-align: center;
    padding: 40px 0;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(55, 53, 47, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-blue);
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

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

/* Article Cards */
.articles-container {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.article-card {
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(55, 53, 47, 0.16);
}

.article-card:last-child {
    border-bottom: none;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--sidebar-text);
    margin-bottom: 8px;
}

.article-source {
    font-weight: 600;
    color: var(--text-color);
}

.article-headline {
    font-size: 28px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: 12px;
    display: block;
    text-decoration: none;
    color: var(--text-color);
}

.article-headline:hover {
    color: var(--primary-blue);
}

.article-summary {
    font-size: 18px;
    color: var(--text-color-muted);
    margin-bottom: 16px;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.article-category {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--sidebar-text);
    background: var(--hover-surface);
    padding: 2px 8px;
    border-radius: 4px;
}

.read-more {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-blue);
    text-decoration: none;
}

.read-more:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    margin-top: 80px;
    padding-top: 32px;
    border-top: 1px solid rgba(55, 53, 47, 0.16);
    text-align: center;
    font-size: 14px;
    color: var(--sidebar-text);
}

/* Mobile */
@media (max-width: 768px) {
    .container {
        padding: var(--space-24) var(--space-16);
    }

    .app-header {
        padding: var(--space-12) var(--space-16);
        margin: calc(-1 * var(--space-24)) calc(-1 * var(--space-16)) var(--space-20);
    }

    .app-header__title {
        font-size: 28px;
    }
}