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    uint32_t elem_size;
    uint32_t variant_id;
    uint64_t capacity;
    uint64_t total_size;
    uint64_t data_off;         /* 32: offset to data array */
    uint64_t seq_off;          /* 40: offset to per-slot publication seq array */
    uint8_t  _pad0[16];        /* 48-63 */

    uint64_t head;             /* 64: monotonic write cursor (next write position) */
    uint64_t count;            /* 72: total writes (for overwrite detection) */
    uint32_t waiters;          /* 80: blocked on new data */
    uint32_t wake_seq;         /* 84: FUTEX_WAIT target (avoids 64-bit count wraparound) */
    uint64_t stat_writes;      /* 88 */
    uint64_t stat_overwrites;  /* 96 */
    uint8_t  _pad2[24];        /* 104-127 */
} RingHeader;

#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
_Static_assert(sizeof(RingHeader) == 128, "RingHeader must be 128 bytes");
#endif