/* ═══════════════════════════════════════════
   sg-common.css — SportsGear 共享前端样式
   Version: 3.0
   用途：Navbar、按钮、表单、spinner 等跨页面共享UI组件
   ═══════════════════════════════════════════ */

/* ========================================================== */
/* NAVBAR — Global (all pages)                                */
/* ========================================================== */
.sg-navbar {
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    position: sticky;
    top: 0;
    z-index: 10000;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    padding: 0;
    margin: 0;
    text-align: left;
}

.sg-navbar-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    overflow: visible;
}

/* Left side: Logo + Menu */
.sg-navbar-left {
    display: flex;
    align-items: center;
    gap: 32px;
    overflow: visible;
}

.sg-navbar-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--sg-primary, #2d8a4e);
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: -0.3px;
}

.sg-navbar-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    overflow: visible;
}

.sg-nav-item {
    position: relative;
}

.sg-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    color: #475569;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}
.sg-nav-link:hover {
    background: #f1f5f9;
    color: var(--sg-primary, #2d8a4e);
}

/* Dropdown arrow */
.sg-dropdown-arrow {
    font-size: 10px;
    transition: transform 0.2s;
}
.sg-nav-has-dropdown.is-open .sg-dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown menu */
.sg-nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    max-height: 400px;
    overflow-y: auto;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    padding: 6px 0;
    z-index: 1001;
}
.sg-nav-has-dropdown.is-open .sg-nav-dropdown,
.sg-nav-has-dropdown:hover .sg-nav-dropdown {
    display: block;
}
.sg-dropdown-toggle {
    cursor: pointer;
}

.sg-dropdown-item {
    display: block;
    padding: 10px 18px;
    color: #334155;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.12s;
}
.sg-dropdown-item:hover {
    background: #f1f5f9;
    color: var(--sg-primary, #2d8a4e);
}

.sg-dropdown-empty {
    display: block;
    padding: 10px 18px;
    color: #94a3b8;
    font-size: 13px;
}

/* Right side */
.sg-navbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ─────────── Navbar Search Box ─────────── */
.sg-nav-search {
    margin-left: 8px;
    position: relative;
}
.sg-nav-search form {
    display: flex;
    align-items: center;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 0 10px;
    height: 34px;
    transition: border-color 0.15s, background 0.15s;
    min-width: 200px;
}
.sg-nav-search form:focus-within {
    border-color: var(--sg-primary, #2d8a4e);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(4,107,210,0.1);
}
.sg-nav-search-icon {
    font-size: 14px;
    margin-right: 6px;
    flex-shrink: 0;
    line-height: 1;
}
.sg-nav-search-input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-size: 13px;
    color: #1a1a2e;
    height: 100%;
    min-width: 0;
}
.sg-nav-search-input::placeholder {
    color: #94a3b8;
}

/* ─────────── Navbar Responsive ─────────── */
@media (max-width: 768px) {
    .sg-navbar-inner {
        padding: 0 16px;
        height: 50px;
        flex-wrap: wrap;
    }
    .sg-navbar-left {
        gap: 16px;
        flex-wrap: wrap;
    }
    .sg-navbar-logo {
        font-size: 15px;
    }
    .sg-nav-link {
        padding: 6px 10px;
        font-size: 13px;
    }
    .sg-nav-dropdown {
        min-width: 160px;
    }
    .sg-nav-search {
        margin-left: 0;
        width: 100%;
        order: 10;
        padding: 4px 0 6px;
    }
    .sg-nav-search form {
        min-width: 0;
        width: 100%;
        height: 32px;
    }
    .sg-navbar-menu {
        flex-wrap: wrap;
    }
}

/* ========================================================== */
/* BUTTONS                                                    */
/* ========================================================== */
.sg-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: var(--sg-radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.sg-btn-primary {
    background: var(--sg-text);
    color: #ffffff;
}

.sg-btn-primary:hover {
    background: var(--sg-primary);
}

.sg-btn-accent {
    background: var(--sg-accent);
    color: #ffffff;
}

.sg-btn-accent:hover {
    background: var(--sg-primary-hover);
}

/* ─────────── Form Elements ─────────── */
.sg-input,
.sg-select,
.sg-textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #2a3550;
    border-radius: var(--sg-radius-sm);
    background: #f8faf9;
    font-size: 14px;
    color: var(--sg-text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-sizing: border-box;
}

.sg-input:focus,
.sg-select:focus,
.sg-textarea:focus {
    outline: none;
    border-color: var(--sg-primary, #2d8a4e);
    box-shadow: 0 0 0 3px rgba(45, 138, 78, 0.15);
}

.sg-textarea {
    resize: vertical;
    min-height: 80px;
}

/* ─────────── Utility Classes ─────────── */
.sg-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

.sg-text-center {
    text-align: center;
}

/* ─────────── Shared Animation (used by spinner/loading) ─────────── */
@keyframes sg-spin {
    to { transform: rotate(360deg); }
}

/* ─────────── Loading / Spinner ─────────── */
.sg-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid #ffffff;
    border-top-color: transparent;
    border-radius: 50%;
    animation: sg-spin 0.6s linear infinite;
    margin: 0 auto;
}

.sg-spinner-dark {
    border-color: #1a1a1a;
    border-top-color: transparent;
}

/* ─────────── Focus Ring (shared for all form inputs) ─────────── */
.sg-input:focus,
.sg-select:focus,
.sg-textarea:focus {
    outline: none;
    border-color: var(--sg-primary, #2d8a4e);
    box-shadow: 0 0 0 3px rgba(45, 138, 78, 0.15);
}

/* ─────────── Disabled button state (shared) ─────────── */
.sg-btn:disabled,
.sg-btn-primary:disabled,
.sg-btn-accent:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}